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.

A269202 Number of 2 X n 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three no more than once.

Table of values

n a(n)
1 16
2 180
3 1284
4 9612
5 68052
6 472044
7 3212820
8 21562476
9 143085588
10 940780908
11 6138286356
12 39791327340
13 256517615124
14 1645723601772
15 10514049071892
16 66922539204204
17 424564703856660
18 2685565034934636
19 16942451080369428

List of values

[16, 180, 1284, 9612, 68052, 472044, 3212820, 21562476, 143085588, 940780908, 6138286356, 39791327340, 256517615124, 1645723601772, 10514049071892, 66922539204204, 424564703856660, 2685565034934636, 16942451080369428]

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

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