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.

A269270 Number of n X 2 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.

Table of values

n a(n)
1 4
2 108
3 1620
4 20412
5 236196
6 2598156
7 27634932
8 286978140
9 2927177028
10 29443957164
11 292889889684
12 2887057484028
13 28242953648100
14 274521509459532
15 2653707924775476
16 25530500379736476
17 244598664928443012

List of values

[4, 108, 1620, 20412, 236196, 2598156, 27634932, 286978140, 2927177028, 29443957164, 292889889684, 2887057484028, 28242953648100, 274521509459532, 2653707924775476, 25530500379736476, 244598664928443012]

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

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