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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.

A222138 Number of nX2 0..4 arrays with no entry increasing mod 5 by 4 rightwards or downwards, starting with upper left zero.

Table of values

n a(n)
1 4
2 52
3 676
4 8788
5 114244
6 1485172
7 19307236
8 250994068
9 3262922884
10 42417997492
11 551433967396
12 7168641576148
13 93192340489924
14 1211500426369012
15 15749505542797156
16 204743572056363028
17 2661666436732719364

List of values

[4, 52, 676, 8788, 114244, 1485172, 19307236, 250994068, 3262922884, 42417997492, 551433967396, 7168641576148, 93192340489924, 1211500426369012, 15749505542797156, 204743572056363028, 2661666436732719364]

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

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