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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.

A220999 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor.

Table of values

n a(n)
1 21
2 2989
3 394580
4 51672851
5 6758547145
6 883809591160
7 115571009291599
8 15112491898694315
9 1976162121051496204
10 258409744432367037405
11 33790541796768618273627
12 4418566652828051992947794

List of values

[21, 2989, 394580, 51672851, 6758547145, 883809591160, 115571009291599, 15112491898694315, 1976162121051496204, 258409744432367037405, 33790541796768618273627, 4418566652828051992947794]

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

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