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.

A241287 Number of 5Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.

Table of values

n a(n)
1 56
2 139
3 1615
4 6783
5 20717
6 451318
7 1543713
8 8288114
9 79113707
10 276340333
11 1878731208
12 14642190232
13 59010752583
14 404841299508
15 2875913561864
16 13757588225177
17 90753330244908
18 606550462257317
19 3111205949073436

List of values

[56, 139, 1615, 6783, 20717, 451318, 1543713, 8288114, 79113707, 276340333, 1878731208, 14642190232, 59010752583, 404841299508, 2875913561864, 13757588225177, 90753330244908, 606550462257317, 3111205949073436]