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.

A185829 Half the number of nX3 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Table of values

n a(n)
1 1
2 10
3 30
4 118
5 393
6 1430
7 5004
8 17877
9 63181
10 224324
11 794939
12 2819380
13 9995857
14 35445025
15 125677385
16 445630567
17 1580102608
18 5602722348
19 19866041906
20 70440800557
21 249768066156
22 885624613914
23 3140236676877
24 11134612682393

List of values

[1, 10, 30, 118, 393, 1430, 5004, 17877, 63181, 224324, 794939, 2819380, 9995857, 35445025, 125677385, 445630567, 1580102608, 5602722348, 19866041906, 70440800557, 249768066156, 885624613914, 3140236676877, 11134612682393]

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

Content is available under The OEIS End-User License Agreement.