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.

A183521 Number of nX4 0..2 arrays with each element equal to either the sum mod 3 of its horizontal and vertical neighbors or the sum mod 3 of its diagonal and antidiagonal neighbors.

Table of values

n a(n)
1 7
2 95
3 543
4 3507
5 27609
6 201833
7 1521573
8 11678037
9 89238523
10 683029435
11 5235031077
12 40141122349
13 307807564417
14 2360732530937
15 18105826441313
16 138867315400205
17 1065099011259479
18 8169267911756541
19 62658120915577663

List of values

[7, 95, 543, 3507, 27609, 201833, 1521573, 11678037, 89238523, 683029435, 5235031077, 40141122349, 307807564417, 2360732530937, 18105826441313, 138867315400205, 1065099011259479, 8169267911756541, 62658120915577663]

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

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