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.

A231758 Number of (n+1)X(2+1) 0..1 arrays with no element having a strict majority of its horizontal, diagonal and antidiagonal neighbors equal to one.

Table of values

n a(n)
1 33
2 136
3 660
4 3213
5 14989
6 70927
7 338352
8 1603633
9 7596720
10 36066272
11 171140301
12 811651995
13 3850637109
14 18269376384
15 86668158745
16 411153474416
17 1950577525332
18 9253691650061
19 43899995716425
20 208265361505983
21 988028267125504

List of values

[33, 136, 660, 3213, 14989, 70927, 338352, 1603633, 7596720, 36066272, 171140301, 811651995, 3850637109, 18269376384, 86668158745, 411153474416, 1950577525332, 9253691650061, 43899995716425, 208265361505983, 988028267125504]

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

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