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.

A202796 Number of n X 2 binary arrays with every one adjacent to another one horizontally or vertically.

Table of values

n a(n)
1 2
2 10
3 36
4 126
5 454
6 1632
7 5854
8 21010
9 75412
10 270662
11 971438
12 3486624
13 12513958
14 44914250
15 161203204
16 578579694
17 2076599286
18 7453190368
19 26750489166
20 96011055010
21 344596415668
22 1236802258678
23 4439047411742
24 15932330156576

List of values

[2, 10, 36, 126, 454, 1632, 5854, 21010, 75412, 270662, 971438, 3486624, 12513958, 44914250, 161203204, 578579694, 2076599286, 7453190368, 26750489166, 96011055010, 344596415668, 1236802258678, 4439047411742, 15932330156576]

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

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