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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.

A230677 Number of 3Xn 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 81
3 1173
4 18915
5 340563
6 6081561
7 108108231
8 1923264723
9 34219066161
10 608809697883
11 10831633601715
12 192711252863829
13 3428626492612815
14 61000479835023903
15 1085291316379044081
16 19308983258977687575

List of values

[0, 81, 1173, 18915, 340563, 6081561, 108108231, 1923264723, 34219066161, 608809697883, 10831633601715, 192711252863829, 3428626492612815, 61000479835023903, 1085291316379044081, 19308983258977687575]

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

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