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.

A268899 Number of n X 3 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two exactly once.

Table of values

n a(n)
1 12
2 168
3 1584
4 12960
5 98496
6 715392
7 5038848
8 34712064
9 235146240
10 1572120576
11 10400182272
12 68205846528
13 444063596544
14 2873352683520
15 18493942726656
16 118486616113152
17 756057455198208
18 4807171282305024
19 30467987000524800

List of values

[12, 168, 1584, 12960, 98496, 715392, 5038848, 34712064, 235146240, 1572120576, 10400182272, 68205846528, 444063596544, 2873352683520, 18493942726656, 118486616113152, 756057455198208, 4807171282305024, 30467987000524800]

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

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