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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.

A301607 Number of nX7 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 21
3 55
4 755
5 6393
6 60841
7 591585
8 5880829
9 58383932
10 585233819
11 5854941545
12 58759934077
13 589360075403
14 5914609427757
15 59355963113549
16 595731234612875
17 5979121155775603
18 60011713256358774
19 602331412174313879

List of values

[1, 21, 55, 755, 6393, 60841, 591585, 5880829, 58383932, 585233819, 5854941545, 58759934077, 589360075403, 5914609427757, 59355963113549, 595731234612875, 5979121155775603, 60011713256358774, 602331412174313879]

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

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