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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.

A230678 Number of 4Xn 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j).

Table of values

n a(n)
1 0
2 423
3 17271
4 730503
5 37034355
6 1844154933
7 91258562955
8 4522036938501
9 224105728666527
10 11105653159056021
11 550345235166102387
12 27272655718068842535
13 1351510936295338591335
14 66974836192708860686913

List of values

[0, 423, 17271, 730503, 37034355, 1844154933, 91258562955, 4522036938501, 224105728666527, 11105653159056021, 550345235166102387, 27272655718068842535, 1351510936295338591335, 66974836192708860686913]

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

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