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.

A239854 Number of nX4 0..3 arrays with no element equal to zero 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 6
2 12
3 78
4 203
5 484
6 1757
7 4979
8 19850
9 68830
10 207822
11 799573
12 2488921
13 8261626
14 29985170
15 94570580
16 336674607
17 1151293607
18 3775219224
19 13467393979
20 44587173533
21 151997573760
22 528796519331
23 1751682284364
24 6079087768020

List of values

[6, 12, 78, 203, 484, 1757, 4979, 19850, 68830, 207822, 799573, 2488921, 8261626, 29985170, 94570580, 336674607, 1151293607, 3775219224, 13467393979, 44587173533, 151997573760, 528796519331, 1751682284364, 6079087768020]