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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.

A019318 Number of inequivalent ways of choosing n squares from an n X n board, considering rotations and reflections to be the same.

Table of values

n a(n)
1 1
2 2
3 16
4 252
5 6814
6 244344
7 10746377
8 553319048
9 32611596056
10 2163792255680
11 159593799888052
12 12952412056879996
13 1147044793316531040
14 110066314584030859544
15 11375695977099383509351
16 1259843950257390597789296
17 148842380543159458506703546
18 18685311541775061906510072648
19 2483858381692984848273972297368
20 348545122958862200122401771463328

List of values

[1, 2, 16, 252, 6814, 244344, 10746377, 553319048, 32611596056, 2163792255680, 159593799888052, 12952412056879996, 1147044793316531040, 110066314584030859544, 11375695977099383509351, 1259843950257390597789296, 148842380543159458506703546, 18685311541775061906510072648, 2483858381692984848273972297368, 348545122958862200122401771463328]

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

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