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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.

A240408 Number of nX3 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 4
2 32
3 202
4 1526
5 10749
6 79090
7 573490
8 4185321
9 30488162
10 222232658
11 1619848067
12 11805053329
13 86050232733
14 627116919124
15 4571009728681
16 33313730895602
17 242812260697701
18 1769667060944824
19 12898232020096920
20 94006154577642335

List of values

[4, 32, 202, 1526, 10749, 79090, 573490, 4185321, 30488162, 222232658, 1619848067, 11805053329, 86050232733, 627116919124, 4571009728681, 33313730895602, 242812260697701, 1769667060944824, 12898232020096920, 94006154577642335]

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

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