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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.

A071308 a(n) = (1/2) * (number of n X n 0..9 matrices with MM' mod 10 = I).

Table of values

n a(n)
1 1
2 8
3 720
4 691200
5 6739200000
6 668528640000000
7 663347543040000000000
8 6622861869711360000000000000
9 660754650163765248000000000000000000
10 660543208675712843120640000000000000000000000
11 6601093143555139842468151296000000000000000000000000000

List of values

[1, 8, 720, 691200, 6739200000, 668528640000000, 663347543040000000000, 6622861869711360000000000000, 660754650163765248000000000000000000, 660543208675712843120640000000000000000000000, 6601093143555139842468151296000000000000000000000000000]

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

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