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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.

A268758 Number of polyominoes with width and height equal to 2n that are invariant under all symmetries of the square.

Table of values

n a(n)
1 1
2 3
3 17
4 163
5 2753
6 84731
7 4879497
8 535376723
9 112921823249
10 45931435159067
11 36048888105745113
12 54568015172025197171
13 159197415409641803530753
14 894444473815989281612355579
15 9671160618112663336510127727593
16 201110001346886305066013828873025811

List of values

[1, 3, 17, 163, 2753, 84731, 4879497, 535376723, 112921823249, 45931435159067, 36048888105745113, 54568015172025197171, 159197415409641803530753, 894444473815989281612355579, 9671160618112663336510127727593, 201110001346886305066013828873025811]

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

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