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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.

A240324 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, modulo 4.

Table of values

n a(n)
1 6
2 37
3 455
4 3374
5 21455
6 189549
7 1190246
8 8903613
9 70945972
10 460466581
11 3565876476
12 26437586127
13 180411185989
14 1394924206374
15 9999389423346
16 71022206087648
17 538759260350717
18 3826996325512698
19 27847080935840982

List of values

[6, 37, 455, 3374, 21455, 189549, 1190246, 8903613, 70945972, 460466581, 3565876476, 26437586127, 180411185989, 1394924206374, 9999389423346, 71022206087648, 538759260350717, 3826996325512698, 27847080935840982]

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

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