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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.

A240267 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 one plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 10
2 35
3 118
4 582
5 2000
6 8353
7 37422
8 135463
9 580528
10 2403439
11 9094559
12 38858731
13 155489063
14 610603047
15 2566277060
16 10164936522
17 40839681679
18 168734662196
19 669445744507
20 2718398151862
21 11090164669401
22 44257273047277

List of values

[10, 35, 118, 582, 2000, 8353, 37422, 135463, 580528, 2403439, 9094559, 38858731, 155489063, 610603047, 2566277060, 10164936522, 40839681679, 168734662196, 669445744507, 2718398151862, 11090164669401, 44257273047277]

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

Content is available under The OEIS End-User License Agreement.