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.

A069396 Half the number of 3 X n binary arrays with a path of adjacent 1's and a path of adjacent 0's from top row to bottom row.

Table of values

n a(n)
2 1
3 25
4 377
5 4541
6 48329
7 476389
8 4461489
9 40306317
10 354713977
11 3060942133
12 26020259201
13 218626028573
14 1820140085705
15 15043088032837
16 123602247055953
17 1010793162739629
18 8234370308667673
19 66870924588036181

List of values

[1, 25, 377, 4541, 48329, 476389, 4461489, 40306317, 354713977, 3060942133, 26020259201, 218626028573, 1820140085705, 15043088032837, 123602247055953, 1010793162739629, 8234370308667673, 66870924588036181]

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

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