cp's OEIS Frontend

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.

A183310 Half the number of nX9 binary arrays with no element equal to a strict majority of its horizontal and vertical neighbors.

Table of values

n a(n)
1 21
2 56
3 997
4 18064
5 445859
6 10149621
7 234636215
8 5406312318
9 124597748299
10 2872365166632
11 66225579904258
12 1527174330126193
13 35219108887364016
14 812230463677554629
15 18731997169049673477
16 432004778124039265271

List of values

[21, 56, 997, 18064, 445859, 10149621, 234636215, 5406312318, 124597748299, 2872365166632, 66225579904258, 1527174330126193, 35219108887364016, 812230463677554629, 18731997169049673477, 432004778124039265271]

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

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