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.

A241055 Number of 2 X n 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 zero 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 2
2 3
3 2
4 10
5 18
6 18
7 46
8 58
9 102
10 173
11 264
12 487
13 738
14 1318
15 2151
16 3591
17 6192
18 10096
19 17480
20 28925
21 49131
22 82966
23 138977
24 236535
25 395979
26 671706
27 1131018
28 1908201
29 3226558
30 5432423
31 9189152
32 15486612
33 26156656
34 44151446
35 74485403
36 125808822

List of values

[2, 3, 2, 10, 18, 18, 46, 58, 102, 173, 264, 487, 738, 1318, 2151, 3591, 6192, 10096, 17480, 28925, 49131, 82966, 138977, 236535, 395979, 671706, 1131018, 1908201, 3226558, 5432423, 9189152, 15486612, 26156656, 44151446, 74485403, 125808822]