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.

A268965 Number of n X 2 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

Table of values

n a(n)
1 9
2 60
3 336
4 1728
5 8448
6 39936
7 184320
8 835584
9 3735552
10 16515072
11 72351744
12 314572800
13 1358954496
14 5838471168
15 24964497408
16 106300440576
17 450971566080
18 1906965479424
19 8040178778112
20 33809982554112
21 141836999983104

List of values

[9, 60, 336, 1728, 8448, 39936, 184320, 835584, 3735552, 16515072, 72351744, 314572800, 1358954496, 5838471168, 24964497408, 106300440576, 450971566080, 1906965479424, 8040178778112, 33809982554112, 141836999983104]

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

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