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.

A197470 Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,1,0,0,0 for x=0,1,2,3,4.

Table of values

n a(n)
1 3
2 6
3 26
4 46
5 181
6 374
7 1300
8 2886
9 9446
10 22060
11 69096
12 167466
13 507600
14 1265434
15 3741192
16 9529514
17 27644128
18 71580304
19 204668940
20 536641128
21 1517618972
22 4017418484
23 11266355518
24 30042504088
25 83713614532
26 224474050480

List of values

[3, 6, 26, 46, 181, 374, 1300, 2886, 9446, 22060, 69096, 167466, 507600, 1265434, 3741192, 9529514, 27644128, 71580304, 204668940, 536641128, 1517618972, 4017418484, 11266355518, 30042504088, 83713614532, 224474050480]

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

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