cp's OEIS Frontend

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.

A269480 Number of 3Xn arrays containing n copies of 0..3-1 avoiding the pattern down-up in every row and equal-up in every column.

Table of values

n a(n)
1 4
2 54
3 574
4 6404
5 72110
6 816583
7 9323584
8 107089479
9 1236171969
10 14324836704
11 166516037345
12 1940477033553
13 22659370920439
14 265044574417791
15 3104569328697374
16 36408281098910933
17 427405044547342278

List of values

[4, 54, 574, 6404, 72110, 816583, 9323584, 107089479, 1236171969, 14324836704, 166516037345, 1940477033553, 22659370920439, 265044574417791, 3104569328697374, 36408281098910933, 427405044547342278]

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

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