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.

A240758 Number of nX4 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 zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Table of values

n a(n)
1 25
2 42
3 142
4 348
5 653
6 1809
7 3606
8 8307
9 20609
10 42658
11 103913
12 235174
13 519261
14 1234747
15 2728224
16 6283093
17 14453348
18 32323190
19 74859774
20 169422762
21 385308220
22 885034945
23 2001772191
24 4581389621
25 10446058187
26 23735064262
27 54294354277

List of values

[25, 42, 142, 348, 653, 1809, 3606, 8307, 20609, 42658, 103913, 235174, 519261, 1234747, 2728224, 6283093, 14453348, 32323190, 74859774, 169422762, 385308220, 885034945, 2001772191, 4581389621, 10446058187, 23735064262, 54294354277]