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.

A239860 Number of 3Xn 0..3 arrays with no element equal to zero 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 4
2 5
3 44
4 78
5 255
6 742
7 1382
8 5647
9 14755
10 33946
11 120389
12 305123
13 717503
14 2451925
15 6276842
16 15461619
17 51283453
18 130329061
19 331984698
20 1067700153
21 2718467454
22 7099921104
23 22241389875
24 56803646347
25 151320850227
26 463374925294

List of values

[4, 5, 44, 78, 255, 742, 1382, 5647, 14755, 33946, 120389, 305123, 717503, 2451925, 6276842, 15461619, 51283453, 130329061, 331984698, 1067700153, 2718467454, 7099921104, 22241389875, 56803646347, 151320850227, 463374925294]