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.

A269215 Number of 2 X n 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.

Table of values

n a(n)
1 0
2 96
3 768
4 6528
5 49536
6 360960
7 2546304
8 17563392
9 119091072
10 796813824
11 5274483840
12 34608512256
13 225420724608
14 1459142258688
15 9394561013376
16 60205610853120
17 384263133750144
18 2443755614295552
19 15491594556534912

List of values

[0, 96, 768, 6528, 49536, 360960, 2546304, 17563392, 119091072, 796813824, 5274483840, 34608512256, 225420724608, 1459142258688, 9394561013376, 60205610853120, 384263133750144, 2443755614295552, 15491594556534912]

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

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