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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.

A239996 Number of n X 3 0..3 arrays with no element equal to one plus the sum of elements to its left or two 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 4
2 25
3 190
4 1372
5 10405
6 83029
7 685898
8 5825700
9 50417154
10 441675344
11 3899065908
12 34583504110
13 307633283500
14 2741312316323
15 24453522555996
16 218272506712305
17 1949041652201113
18 17407703510071602
19 155496451538874916
20 1389102990940616855
21 12409927401794044619

List of values

[4, 25, 190, 1372, 10405, 83029, 685898, 5825700, 50417154, 441675344, 3899065908, 34583504110, 307633283500, 2741312316323, 24453522555996, 218272506712305, 1949041652201113, 17407703510071602, 155496451538874916, 1389102990940616855, 12409927401794044619]

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

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