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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.

A240403 Number of nX4 0..3 arrays with no element equal to one plus the sum of elements to its left or three 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 24
3 235
4 1304
5 13648
6 98837
7 692520
8 6686074
9 47001423
10 368795251
11 3172886576
12 22843492846
13 188803534301
14 1516806583206
15 11402126592178
16 94073248811059
17 733120766691045
18 5706868084005386
19 46267999865467117
20 358824411389642466

List of values

[4, 24, 235, 1304, 13648, 98837, 692520, 6686074, 47001423, 368795251, 3172886576, 22843492846, 188803534301, 1516806583206, 11402126592178, 94073248811059, 733120766691045, 5706868084005386, 46267999865467117, 358824411389642466]

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

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