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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.

A240402 Number of nX3 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 3
2 14
3 77
4 235
5 1381
6 5566
7 21413
8 114951
9 447479
10 1942846
11 9296148
12 37136986
13 169442132
14 756650294
15 3157572233
16 14387587626
17 62384424058
18 269023025478
19 1206596042127
20 5204663585354
21 22811833314490
22 100879086151468

List of values

[3, 14, 77, 235, 1381, 5566, 21413, 114951, 447479, 1942846, 9296148, 37136986, 169442132, 756650294, 3157572233, 14387587626, 62384424058, 269023025478, 1206596042127, 5204663585354, 22811833314490, 100879086151468]

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

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