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.

A196490 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,3,0,1,4 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 9
3 69
4 435
5 2862
6 18661
7 123151
8 806609
9 5276054
10 34627688
11 227088449
12 1488439691
13 9758458572
14 63980053571
15 419459699173
16 2750044671305
17 18029789774081
18 118205954690054
19 774976155585421
20 5080869712707658

List of values

[1, 9, 69, 435, 2862, 18661, 123151, 806609, 5276054, 34627688, 227088449, 1488439691, 9758458572, 63980053571, 419459699173, 2750044671305, 18029789774081, 118205954690054, 774976155585421, 5080869712707658]

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

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