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.

A240799 Total number of occurrences of the pattern 1=2<3 in all preferential arrangements (or ordered partitions) of n elements.

Table of values

n a(n)
1 0
2 0
3 1
4 20
5 310
6 4660
7 72485
8 1193080
9 20938764
10 392485560
11 7850724915
12 167242351100
13 3785057708146
14 90775554103052
15 2301045251519105
16 61499717442074800
17 1729026306941190680
18 51022485837639054768
19 1577126907722325214959
20 50967150013960792511700

List of values

[0, 0, 1, 20, 310, 4660, 72485, 1193080, 20938764, 392485560, 7850724915, 167242351100, 3785057708146, 90775554103052, 2301045251519105, 61499717442074800, 1729026306941190680, 51022485837639054768, 1577126907722325214959, 50967150013960792511700]

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

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