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.

A228757 Number of 5Xn binary arrays with top left element equal to 1 and no two ones adjacent horizontally or antidiagonally.

Table of values

n a(n)
1 16
2 55
3 723
4 4808
5 43862
6 342207
7 2876170
8 23326164
9 192379841
10 1574217212
11 12928573892
12 106000461919
13 869759215471
14 7134075563384
15 58525595955046
16 480089753747591
17 3938341082031018
18 32307082900690396
19 265023929648410933

List of values

[16, 55, 723, 4808, 43862, 342207, 2876170, 23326164, 192379841, 1574217212, 12928573892, 106000461919, 869759215471, 7134075563384, 58525595955046, 480089753747591, 3938341082031018, 32307082900690396, 265023929648410933]

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

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