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.

A208137 Number of n X n 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.

Table of values

n a(n)
1 2
2 16
3 108
4 900
5 6300
6 50176
7 352800
8 2722500
9 19111950
10 144288144
11 1010017008
12 7505103424
13 52382558592
14 384598425600
15 2677165603200
16 19473033306276
17 135229397960250
18 976281270250000
19 6765629202832500
20 48545357372612100

List of values

[2, 16, 108, 900, 6300, 50176, 352800, 2722500, 19111950, 144288144, 1010017008, 7505103424, 52382558592, 384598425600, 2677165603200, 19473033306276, 135229397960250, 976281270250000, 6765629202832500, 48545357372612100]

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

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