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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.

A287239 Number of inequivalent n X n matrices over an alphabet of size 6 under action of dihedral group of the square D_4, with one-sixth each of 1s, 2s, 3s, 4s, 5s and 6s (ordered occurrences rounded up/down if n^2 != 0 mod 6).

Table of values

n a(n)
0 1
1 1
2 1
3 5688
4 504508320
5 2029169127793680
6 333772217080092664473600
7 1966297518276227170017585421188600
8 474436367892839446541884570454351985506872320
9 4529567636413022031420100639004131328550592354551163392000
10 1664947024157601976065851576560401128416782438266187161307818265349050000

List of values

[1, 1, 1, 5688, 504508320, 2029169127793680, 333772217080092664473600, 1966297518276227170017585421188600, 474436367892839446541884570454351985506872320, 4529567636413022031420100639004131328550592354551163392000, 1664947024157601976065851576560401128416782438266187161307818265349050000]

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

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