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.

A240414 Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 11
2 33
3 202
4 846
5 3035
6 17075
7 65790
8 283052
9 1383887
10 5430572
11 24942550
12 111942189
13 462444973
14 2123240962
15 9194726059
16 39505113112
17 178049613558
18 765870935841
19 3356043819951
20 14873017976807
21 64294462854133

List of values

[11, 33, 202, 846, 3035, 17075, 65790, 283052, 1383887, 5430572, 24942550, 111942189, 462444973, 2123240962, 9194726059, 39505113112, 178049613558, 765870935841, 3356043819951, 14873017976807, 64294462854133]