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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.

A209251 Number of n X n checkered tori, allowing rotation and/or reflection of the rows and/or the columns.

Table of values

n a(n)
0 1
1 2
2 7
3 36
4 1459
5 340880
6 478070832
7 2872221202512
8 72057630729710704
9 7462505061854009276768
10 3169126500599982009308551168
11 5492677668532714149024993226980288
12 38716571525226776692749451887896112574464

List of values

[1, 2, 7, 36, 1459, 340880, 478070832, 2872221202512, 72057630729710704, 7462505061854009276768, 3169126500599982009308551168, 5492677668532714149024993226980288, 38716571525226776692749451887896112574464]

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

Content is available under The OEIS End-User License Agreement.