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.

A219880 Number of nX5 arrays of the minimum value of corresponding elements and their horizontal, diagonal 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 24
3 292
4 2190
5 14536
6 89795
7 565824
8 3605746
9 22430565
10 132945658
11 747855900
12 4015816403
13 20719013269
14 103153843621
15 496871314897
16 2319802248962
17 10515430463734
18 46349614135168
19 198938106785464
20 832494580725450

List of values

[15, 24, 292, 2190, 14536, 89795, 565824, 3605746, 22430565, 132945658, 747855900, 4015816403, 20719013269, 103153843621, 496871314897, 2319802248962, 10515430463734, 46349614135168, 198938106785464, 832494580725450]

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

Content is available under The OEIS End-User License Agreement.