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.

A240002 Number of 3 X n 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 12
2 61
3 190
4 526
5 1262
6 2766
7 5647
8 10878
9 19971
10 35180
11 59780
12 98414
13 157524
14 245879
15 375214
16 560995
17 823326
18 1188015
19 1687817
20 2363873
21 3267365
22 4461408
23 6023201
24 8046460
25 10644157
26 13951590
27 18129810
28 23369432
29 29894858
30 37968941

List of values

[12, 61, 190, 526, 1262, 2766, 5647, 10878, 19971, 35180, 59780, 98414, 157524, 245879, 375214, 560995, 823326, 1188015, 1687817, 2363873, 3267365, 4461408, 6023201, 8046460, 10644157, 13951590, 18129810, 23369432, 29894858, 37968941]