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.

A197277 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,1,1,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 9
2 67
3 317
4 2731
5 16890
6 114205
7 886737
8 6017949
9 40918349
10 290053910
11 2074566978
12 14599100959
13 101671464178
14 714232555115
15 5052846176923
16 35608078988237
17 249861298059545
18 1755724243450685
19 12370064599008231
20 87120870560445460

List of values

[9, 67, 317, 2731, 16890, 114205, 886737, 6017949, 40918349, 290053910, 2074566978, 14599100959, 101671464178, 714232555115, 5052846176923, 35608078988237, 249861298059545, 1755724243450685, 12370064599008231, 87120870560445460]

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

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