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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.

A240194 Number of 4Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or three plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

n a(n)
1 4
2 27
3 138
4 771
5 5240
6 40765
7 336257
8 2843914
9 24331713
10 209365217
11 1806459338
12 15606899530
13 134920604706
14 1166738652794
15 10090988027354
16 87282067470301
17 754973088693125
18 6530482231898003
19 56488830699787694
20 488631696598081278

List of values

[4, 27, 138, 771, 5240, 40765, 336257, 2843914, 24331713, 209365217, 1806459338, 15606899530, 134920604706, 1166738652794, 10090988027354, 87282067470301, 754973088693125, 6530482231898003, 56488830699787694, 488631696598081278]

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

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