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.

A241285 Number of 3Xn 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 10
2 9
3 41
4 126
5 224
6 934
7 2741
8 5225
9 20537
10 55667
11 113588
12 422541
13 1125360
14 2473769
15 8840311
16 23068806
17 53641026
18 184488860
19 476641936
20 1157699906
21 3848451987
22 9887622772
23 24862454468
24 80220253420
25 205811182949
26 531847795781

List of values

[10, 9, 41, 126, 224, 934, 2741, 5225, 20537, 55667, 113588, 422541, 1125360, 2473769, 8840311, 23068806, 53641026, 184488860, 476641936, 1157699906, 3848451987, 9887622772, 24862454468, 80220253420, 205811182949, 531847795781]