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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.

A186163 1/4 the number of nX4 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Table of values

n a(n)
1 4
2 321
3 14364
4 751266
5 37402872
6 1899336597
7 95752776009
8 4840082975532
9 244420512852030
10 12347377339339755
11 623671780419814416
12 31503432697236966789
13 1591300459563274835532
14 80380228276030331585859

List of values

[4, 321, 14364, 751266, 37402872, 1899336597, 95752776009, 4840082975532, 244420512852030, 12347377339339755, 623671780419814416, 31503432697236966789, 1591300459563274835532, 80380228276030331585859]

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

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