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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.

A185901 1/8 the number of nX4 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Table of values

n a(n)
1 8
2 2765
3 546280
4 139230658
5 32611077940
6 7921723799549
7 1897334511466261
8 457135757368429048
9 109875454057222039886
10 26435697398605508731039
11 6357732815393016703934708
12 1529282331683348275213637905

List of values

[8, 2765, 546280, 139230658, 32611077940, 7921723799549, 1897334511466261, 457135757368429048, 109875454057222039886, 26435697398605508731039, 6357732815393016703934708, 1529282331683348275213637905]

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

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