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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.

A365860 For every cell of a polyomino let c be the number of cells that are in the same row or in the same column (including itself). a(n) is the sum of the c values of all cells of all free polyominoes with n cells.

Table of values

n a(n)
1 1
2 4
3 16
4 62
5 206
6 790
7 3042
8 12648
9 52181
10 220372
11 927333
12 3917738
13 16491489
14 69356256
15 290882884
16 1217780926

List of values

[1, 4, 16, 62, 206, 790, 3042, 12648, 52181, 220372, 927333, 3917738, 16491489, 69356256, 290882884, 1217780926]

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

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