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.

A240800 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 28
5 570
6 10700
7 200235
8 3857672
9 77620788
10 1641549000
11 36576771165
12 859032716740
13 21251178078702
14 553095031003060
15 15122143306215855
16 433634860865610320
17 13020228528050054760
18 408687299328542444880
19 13389274565474007735009
20 457150279686453405468780

List of values

[0, 0, 1, 28, 570, 10700, 200235, 3857672, 77620788, 1641549000, 36576771165, 859032716740, 21251178078702, 553095031003060, 15122143306215855, 433634860865610320, 13020228528050054760, 408687299328542444880, 13389274565474007735009, 457150279686453405468780]

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

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