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.

A239855 Number of nX5 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 8
2 29
3 255
4 1114
5 4549
6 28184
7 125255
8 860559
9 4802971
10 24477675
11 167075425
12 824227912
13 4838346333
14 28474926407
15 141317949021
16 883311612241
17 4759951691561
18 26045766222755
19 156842648720379
20 819459824961446

List of values

[8, 29, 255, 1114, 4549, 28184, 125255, 860559, 4802971, 24477675, 167075425, 824227912, 4838346333, 28474926407, 141317949021, 883311612241, 4759951691561, 26045766222755, 156842648720379, 819459824961446]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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