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.

A197532 Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,1,0,0 for x=0,1,2,3,4.

Table of values

n a(n)
1 4
2 16
3 56
4 216
5 868
6 3500
7 14085
8 56842
9 229706
10 928664
11 3755722
12 15191220
13 61451640
14 248596817
15 1005703793
16 4068662528
17 16460279703
18 66592450774
19 269410213656
20 1089943115100
21 4409547400430
22 17839571907124
23 72173035560719

List of values

[4, 16, 56, 216, 868, 3500, 14085, 56842, 229706, 928664, 3755722, 15191220, 61451640, 248596817, 1005703793, 4068662528, 16460279703, 66592450774, 269410213656, 1089943115100, 4409547400430, 17839571907124, 72173035560719]

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

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