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.

A321276 Sum over all permutations of [n] of the length of the longest increasing subsequence raised to the power of the length of the longest decreasing subsequence.

Table of values

n a(n)
1 1
2 3
3 20
4 174
5 1915
6 25861
7 407691
8 7330188
9 148016449
10 3312032213
11 81207824255
12 2162810487154
13 62125097028962
14 1913156511113517
15 62839800627095263
16 2191735865280260976
17 80859575674731497805
18 3144804693463679033629
19 128550453029684197431607

List of values

[1, 3, 20, 174, 1915, 25861, 407691, 7330188, 148016449, 3312032213, 81207824255, 2162810487154, 62125097028962, 1913156511113517, 62839800627095263, 2191735865280260976, 80859575674731497805, 3144804693463679033629, 128550453029684197431607]

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

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