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.

A002846 Number of ways of transforming a set of n indistinguishable objects into n singletons via a sequence of n-1 refinements.

Table of values

n a(n)
1 1
2 1
3 1
4 2
5 4
6 11
7 33
8 116
9 435
10 1832
11 8167
12 39700
13 201785
14 1099449
15 6237505
16 37406458
17 232176847
18 1513796040
19 10162373172
20 71158660160
21 511957012509
22 3819416719742
23 29195604706757
24 230713267586731
25 1861978821637735
26 15484368121967620
27 131388840051760458

List of values

[1, 1, 1, 2, 4, 11, 33, 116, 435, 1832, 8167, 39700, 201785, 1099449, 6237505, 37406458, 232176847, 1513796040, 10162373172, 71158660160, 511957012509, 3819416719742, 29195604706757, 230713267586731, 1861978821637735, 15484368121967620, 131388840051760458]

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

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