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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.

A365835 For each cell of a polyomino let b be the number of cells that are in the same row or in the same column (including itself). Cells beyond gaps do not count. a(n) is the sum of the b 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
5 204
6 776
7 2936
8 12030
9 48783
10 202734
11 839239
12 3489810
13 14462593
14 59906626
15 247553908
16 1021545890

List of values

[1, 4, 16, 62, 204, 776, 2936, 12030, 48783, 202734, 839239, 3489810, 14462593, 59906626, 247553908, 1021545890]

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

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