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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.

A267284 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any southwest or northwest neighbors modulo 4 and the upper left element equal to 0.

Table of values

n a(n)
1 6
2 5
3 24
4 137
5 1138
6 12214
7 104742
8 741057
9 5022782
10 35540696
11 271621650
12 2252475421
13 19535278570
14 168510129798
15 1410939522686
16 11518135263919
17 93278847927814
18 762132469855714
19 6339718207407286
20 53641859402324039

List of values

[6, 5, 24, 137, 1138, 12214, 104742, 741057, 5022782, 35540696, 271621650, 2252475421, 19535278570, 168510129798, 1410939522686, 11518135263919, 93278847927814, 762132469855714, 6339718207407286, 53641859402324039]

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

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