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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.

A125532 Number of n X n arrays with entries in 1..4 in which adjacent entries differ by 2 or less (adjacent means in x or y directions).

Table of values

n a(n)
0 1
1 4
2 162
3 75398
4 386994338
5 22039625597766
6 13914188992963436802
7 97391265572623379728784646
8 7557580190940015054807296049439074
9 6502004785230840000033839573162175747164038

List of values

[1, 4, 162, 75398, 386994338, 22039625597766, 13914188992963436802, 97391265572623379728784646, 7557580190940015054807296049439074, 6502004785230840000033839573162175747164038]

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

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