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.

A241279 Number of n X 3 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of 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 41
4 236
5 1615
6 12356
7 96171
8 761754
9 6079503
10 48655224
11 389953075
12 3127470262
13 25091008666
14 201333623389
15 1615666305519
16 12966002651979
17 104056784269403
18 835102517412497
19 6702114259119338
20 53787979810054439

List of values

[4, 5, 41, 236, 1615, 12356, 96171, 761754, 6079503, 48655224, 389953075, 3127470262, 25091008666, 201333623389, 1615666305519, 12966002651979, 104056784269403, 835102517412497, 6702114259119338, 53787979810054439]