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.

A318070 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 4
2 10
3 18
4 41
5 81
6 179
7 404
8 893
9 2000
10 4516
11 10125
12 22737
13 51181
14 115034
15 258515
16 581380
17 1307094
18 2938317
19 6606445
20 14853275
21 33392840
22 75076165
23 168791772
24 379483956
25 853176349
26 1918162541
27 4312510121
28 9695613622
29 21798217755

List of values

[4, 10, 18, 41, 81, 179, 404, 893, 2000, 4516, 10125, 22737, 51181, 115034, 258515, 581380, 1307094, 2938317, 6606445, 14853275, 33392840, 75076165, 168791772, 379483956, 853176349, 1918162541, 4312510121, 9695613622, 21798217755]

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

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