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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.

A230670 Number of n X 3 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 3
2 87
3 1173
4 17271
5 251595
6 3669765
7 53519163
8 780527655
9 11383251453
10 166013909415
11 2421155095347
12 35310246222069
13 514966385300499
14 7510295349852327
15 109530520538219973
16 1597398553655896551

List of values

[3, 87, 1173, 17271, 251595, 3669765, 53519163, 780527655, 11383251453, 166013909415, 2421155095347, 35310246222069, 514966385300499, 7510295349852327, 109530520538219973, 1597398553655896551]

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

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