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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.

A071309 a(n) = (1/2) * (number of n X n 0..10 matrices with MM' mod 11 = I).

Table of values

n a(n)
1 1
2 12
3 1320
4 1742400
5 25721308800
6 4145554781913600
7 7338585441586912128000
8 142998501741091915820267520000
9 30655092458961006120118267244605440000
10 72283553302207308288060341547889057722286080000

List of values

[1, 12, 1320, 1742400, 25721308800, 4145554781913600, 7338585441586912128000, 142998501741091915820267520000, 30655092458961006120118267244605440000, 72283553302207308288060341547889057722286080000]

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

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