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.

A240796 Total number of occurrences of the pattern 1<2 in all preferential arrangements (or ordered partitions) of n elements.

Table of values

n a(n)
1 0
2 1
3 15
4 186
5 2330
6 31065
7 447405
8 6979588
9 117745668
10 2141106795
11 41810587775
12 873474855726
13 19451904450654
14 460209050303821
15 11531197020389025
16 305122289460210120
17 8503747639606509128
18 249020038061419770783
19 7645072502094118876755
20 245564189847880300238290

List of values

[0, 1, 15, 186, 2330, 31065, 447405, 6979588, 117745668, 2141106795, 41810587775, 873474855726, 19451904450654, 460209050303821, 11531197020389025, 305122289460210120, 8503747639606509128, 249020038061419770783, 7645072502094118876755, 245564189847880300238290]

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

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