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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.

A184370 1/3 the number of (n+1)X4 0..2 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically.

Table of values

n a(n)
1 1107
2 49235
3 2167173
4 95528423
5 4210059673
6 185547841629
7 8177524177277
8 360402692568245
9 15883791500540967
10 700035935394350709
11 30852225032929689819
12 1359729896274471875219
13 59926484677950059719491

List of values

[1107, 49235, 2167173, 95528423, 4210059673, 185547841629, 8177524177277, 360402692568245, 15883791500540967, 700035935394350709, 30852225032929689819, 1359729896274471875219, 59926484677950059719491]

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

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