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.

A198181 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4.

Table of values

n a(n)
1 2
2 8
3 25
4 59
5 331
6 883
7 3485
8 12030
9 43774
10 155664
11 540628
12 1936313
13 6871687
14 24471790
15 86551688
16 306708029
17 1089956129
18 3870392120
19 13733968845
20 48703981505
21 172844148554
22 613561265167
23 2177517194687
24 7726401450405

List of values

[2, 8, 25, 59, 331, 883, 3485, 12030, 43774, 155664, 540628, 1936313, 6871687, 24471790, 86551688, 306708029, 1089956129, 3870392120, 13733968845, 48703981505, 172844148554, 613561265167, 2177517194687, 7726401450405]

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

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