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.

A219879 Number of nX4 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 nX4 array.

Table of values

n a(n)
1 10
2 17
3 129
4 621
5 2645
6 10350
7 40239
8 155199
9 581728
10 2085519
11 7121374
12 23225035
13 72683520
14 219218974
15 639377404
16 1808073511
17 4967931875
18 13286469360
19 34640551307
20 88162618939
21 219292820124
22 533661457600
23 1271821824645

List of values

[10, 17, 129, 621, 2645, 10350, 40239, 155199, 581728, 2085519, 7121374, 23225035, 72683520, 219218974, 639377404, 1808073511, 4967931875, 13286469360, 34640551307, 88162618939, 219292820124, 533661457600, 1271821824645]

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

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