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.

A207859 Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically.

Table of values

n a(n)
1 10
2 100
3 370
4 1369
5 7289
6 38809
7 178088
8 817216
9 3976696
10 19351201
11 91961095
12 437019025
13 2096687880
14 10059287616
15 48075784344
16 229765876921
17 1099823682601
18 5264542102681
19 25183871849968
20 120471522306304
21 576445792593008

List of values

[10, 100, 370, 1369, 7289, 38809, 178088, 817216, 3976696, 19351201, 91961095, 437019025, 2096687880, 10059287616, 48075784344, 229765876921, 1099823682601, 5264542102681, 25183871849968, 120471522306304, 576445792593008]

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

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