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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.

A240189 Number of nX4 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 three plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 1
2 14
3 129
4 771
5 7170
6 44594
7 333607
8 2715035
9 17332017
10 134735700
11 1005601984
12 6796746485
13 52922791645
14 379298005594
15 2679740305873
16 20445193269447
17 144861185356798
18 1052585343798258
19 7856125918090405
20 55861298280154250

List of values

[1, 14, 129, 771, 7170, 44594, 333607, 2715035, 17332017, 134735700, 1005601984, 6796746485, 52922791645, 379298005594, 2679740305873, 20445193269447, 144861185356798, 1052585343798258, 7856125918090405, 55861298280154250]

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

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