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.

A269647 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 6
2 74
3 574
4 4564
5 41526
6 419516
7 4351224
8 45696410
9 485785550
10 5235947490
11 57045797346
12 626684612988
13 6931703318082
14 77128097640376
15 862658820597866
16 9692104806070332
17 109322097799502508
18 1237402642148758338

List of values

[6, 74, 574, 4564, 41526, 419516, 4351224, 45696410, 485785550, 5235947490, 57045797346, 626684612988, 6931703318082, 77128097640376, 862658820597866, 9692104806070332, 109322097799502508, 1237402642148758338]

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

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