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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.

A276895 Number of ordered set partitions of [n] such that for each block b the smallest integer interval containing b has at most five elements.

Table of values

n a(n)
0 1
1 1
2 3
3 13
4 75
5 541
6 4142
7 34792
8 322904
9 3303160
10 37046948
11 451109712
12 5923255272
13 83424945768
14 1254842021634
15 20081656282038
16 340747127912616
17 6111343349250912
18 115529870445001392
19 2296160998268520576
20 47869541875153872144
21 1044601509263870430000

List of values

[1, 1, 3, 13, 75, 541, 4142, 34792, 322904, 3303160, 37046948, 451109712, 5923255272, 83424945768, 1254842021634, 20081656282038, 340747127912616, 6111343349250912, 115529870445001392, 2296160998268520576, 47869541875153872144, 1044601509263870430000]

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

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