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.

A269180 Number of n X 2 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three exactly once.

Table of values

n a(n)
1 4
2 48
3 384
4 2736
5 18336
6 118032
7 739008
8 4533744
9 27384288
10 163381968
11 965118720
12 5654345136
13 32898781728
14 190290667152
15 1095084877632
16 6274151751024
17 35807326610016
18 203653219107408
19 1154714957732736
20 6529188836867376

List of values

[4, 48, 384, 2736, 18336, 118032, 739008, 4533744, 27384288, 163381968, 965118720, 5654345136, 32898781728, 190290667152, 1095084877632, 6274151751024, 35807326610016, 203653219107408, 1154714957732736, 6529188836867376]

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

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