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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.

A219683 Number of nX5 arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 nX5 array.

Table of values

n a(n)
1 15
2 22
3 208
4 1531
5 8964
6 44816
7 220182
8 1116208
9 5697556
10 28354294
11 135630422
12 623221049
13 2761665622
14 11842133497
15 49237357701
16 198775751684
17 780253085746
18 2982381614057
19 11117260746432
20 40470971856226
21 144060818799022

List of values

[15, 22, 208, 1531, 8964, 44816, 220182, 1116208, 5697556, 28354294, 135630422, 623221049, 2761665622, 11842133497, 49237357701, 198775751684, 780253085746, 2982381614057, 11117260746432, 40470971856226, 144060818799022]

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

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