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.

A318542 Number of n X 5 0..1 arrays with every element unequal to 0, 1, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 8
2 8
3 26
4 78
5 247
6 784
7 2349
8 7191
9 22268
10 68384
11 210050
12 645832
13 1985105
14 6102355
15 18758291
16 57660242
17 177244228
18 544835790
19 1674781291
20 5148145759
21 15824995614
22 48644815851
23 149530340549
24 459644547764
25 1412911535090
26 4343179473160

List of values

[8, 8, 26, 78, 247, 784, 2349, 7191, 22268, 68384, 210050, 645832, 1985105, 6102355, 18758291, 57660242, 177244228, 544835790, 1674781291, 5148145759, 15824995614, 48644815851, 149530340549, 459644547764, 1412911535090, 4343179473160]

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

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