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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A213990 T(n,k)=Number of n X n 0..k matrices whose square is also a 0..k matrix.

Table of values

n a(n)
1 2
2 2
3 11
4 2
5 24
6 172
7 3
8 36
9 1003
10 6327
11 3
12 72
13 2546
14 120133
15 474286
16 3
17 92
18 8168
19 604639
20 35799856
21 67147431
22 3
23 126
24 14030
25 3510112
26 421195466
27 24651985100
28 17080038508
29 3
30 148
31 28328
32 9131098
33 5018010431
34 801373175814

List of values

[2, 2, 11, 2, 24, 172, 3, 36, 1003, 6327, 3, 72, 2546, 120133, 474286, 3, 92, 8168, 604639, 35799856, 67147431, 3, 126, 14030, 3510112, 421195466, 24651985100, 17080038508, 3, 148, 28328, 9131098, 5018010431, 801373175814]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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