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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.

A281717 Number of 3 X n 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

Table of values

n a(n)
1 4
2 4
3 8
4 38
5 90
6 305
7 902
8 2710
9 8376
10 25226
11 77145
12 235122
13 715882
14 2186483
15 6666846
16 20353268
17 62140942
18 189739429
19 579567532
20 1770391431
21 5409031357
22 16528102350
23 50508922108
24 154369025240
25 471828803722
26 1442250315610
27 4408832591287

List of values

[4, 4, 8, 38, 90, 305, 902, 2710, 8376, 25226, 77145, 235122, 715882, 2186483, 6666846, 20353268, 62140942, 189739429, 579567532, 1770391431, 5409031357, 16528102350, 50508922108, 154369025240, 471828803722, 1442250315610, 4408832591287]

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

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