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.

A244491 Number of minimal idempotent generating sets for the singular part P_n \ S_n of the partition monoid P_n.

Table of values

n a(n)
0 1
1 1
2 3
3 20
4 201
5 2604
6 40915
7 754368
8 15960945
9 381141008
10 10139372451
11 297356237760
12 9530800099513
13 331453265976000
14 12430323314648499
15 500046099516905984
16 21478615942550889825
17 981110493372418629888
18 47489191763845877910595

List of values

[1, 1, 3, 20, 201, 2604, 40915, 754368, 15960945, 381141008, 10139372451, 297356237760, 9530800099513, 331453265976000, 12430323314648499, 500046099516905984, 21478615942550889825, 981110493372418629888, 47489191763845877910595]

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

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