A134925 a(n) = floor(n^Pi/2).

Sounds very 'spacey'. The pitch drops pretty rapidly but slows down consistently. Although it slows down quite a bit, we cannot hear ticks or the
exact clicks even toward the end of the file which is around 40 seconds

Residue counts:
2   [5016, 4984]
3   [3325, 3312, 3363]
4   [2510, 2494, 2506, 2490]
5   [2000, 2019, 1909, 2038, 2034]
6   [1683, 1668, 1689, 1642, 1644, 1674]
7   [1450, 1428, 1429, 1417, 1475, 1392, 1409]
8   [1256, 1267, 1244, 1246, 1254, 1227, 1262, 1244]
9   [1156, 1100, 1127, 1103, 1143, 1094, 1066, 1069, 1142]
10   [977, 1029, 945, 1000, 1066, 1023, 990, 964, 1038, 968]
11   [906, 910, 937, 888, 918, 913, 902, 898, 927, 858, 943]
12   [850, 851, 848, 835, 819, 836, 833, 817, 841, 807, 825, 838]

Density information:
A(x) at x=10,100,1000,...:
[4, 18, 81, 351, 1524, 6602, 10000]

A(x)/x at x=10,100,1000,...:
0.4,0.18,0.081,0.0351,0.01524,0.006602,0.001,

First 100 first differences:
[1, 3, 3, 4, 4, 5, 5, 5, 6, 6, 6, 7, 7, 7, 7, 8, 8, 9, 8, 9, 9, 9, 10, 9, 10, 11, 
10, 11, 11, 11, 11, 11, 12, 12, 12, 12, 13, 12, 13, 13, 13, 13, 14, 14, 14, 14, 14, 
14, 15, 15, 15, 15, 15, 15, 16, 15, 16, 16, 17, 16, 16, 17, 17, 17, 17, 17, 17, 
18, 18, 18, 17, 19, 18, 18, 19, 18, 19, 19, 19, 20, 19, 19, 20, 20, 20, 20, 20, 
20, 21, 20, 21, 21, 21, 21, 21, 21, 22, 21, 22, 22]

First 99 second differences:
2,0,1,0,1,0,0,1,0,0,1,0,0,0,1,0,1,-1,1,0,0,1,-1,1,1,-1,1,0,0,0,0,1,0,0,0,1,-1,
1,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,-1,1,0,1,-1,0,1,0,0,0,0,0,1,0,0,-1,2,-1,0,1,
-1,1,0,0,1,-1,0,1,0,0,0,0,0,1,-1,1,0,0,0,0,0,1,-1,1,0,

In the spectrogram there are not spectral lines. It reminds me of the album cover of currents from the musician Tame Impala. 
This sequence falls in the larger category in the form of a(n)=flr[n^a] where a is a non negative 
real number. ex) you can listen to A00290: square numbers and A007590:floor(n^2/2) which sound extremely similar in the way the pitch decreases.

-Jayme Kim