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.

A207594 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 1 1 vertically.

Table of values

n a(n)
1 25
2 625
3 1250
4 5000
5 18150
6 70800
7 263550
8 1018700
9 3824100
10 14714500
11 55475900
12 212837550
13 804627850
14 3080577400
15 11668031250
16 44603903700
17 169169362450
18 645969220100
19 2452350886150
20 9356569191650
21 35546345269650
22 135539969562250

List of values

[25, 625, 1250, 5000, 18150, 70800, 263550, 1018700, 3824100, 14714500, 55475900, 212837550, 804627850, 3080577400, 11668031250, 44603903700, 169169362450, 645969220100, 2452350886150, 9356569191650, 35546345269650, 135539969562250]

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

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