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.

A231518 Number of nX3 0..1 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors.

Table of values

n a(n)
1 4
2 34
3 153
4 776
5 3861
6 18721
7 91993
8 453274
9 2223662
10 10915727
11 53635324
12 263420767
13 1293604417
14 6353594215
15 31205396110
16 153258629442
17 752708346275
18 3696838244354
19 18156489259107
20 89173024237567
21 437961215793703

List of values

[4, 34, 153, 776, 3861, 18721, 91993, 453274, 2223662, 10915727, 53635324, 263420767, 1293604417, 6353594215, 31205396110, 153258629442, 752708346275, 3696838244354, 18156489259107, 89173024237567, 437961215793703]

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

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