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.

A287254 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= four.

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 15
5 52
6 202
7 857
8 3933
9 19373
10 101755
11 566712
12 3331349
13 20592862
14 133439286
15 903926271
16 6385918342
17 46950260915
18 358560107124
19 2839638581291
20 23285101241537
21 197425160416845
22 1728548417051752
23 15610025975013920
24 145242705457704688

List of values

[1, 1, 2, 5, 15, 52, 202, 857, 3933, 19373, 101755, 566712, 3331349, 20592862, 133439286, 903926271, 6385918342, 46950260915, 358560107124, 2839638581291, 23285101241537, 197425160416845, 1728548417051752, 15610025975013920, 145242705457704688]

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

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