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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.

A201697 Number of nX5 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.

Table of values

n a(n)
1 3
2 37
3 989
4 35390
5 930564
6 14268351
7 142436489
8 1034563890
9 5898023820
10 27803725006
11 112491133042
12 401503571755
13 1290797861479
14 3798580774670
15 10363168825912
16 26478119492263
17 63883865534377
18 146539437113683

List of values

[3, 37, 989, 35390, 930564, 14268351, 142436489, 1034563890, 5898023820, 27803725006, 112491133042, 401503571755, 1290797861479, 3798580774670, 10363168825912, 26478119492263, 63883865534377, 146539437113683]

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

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