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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.

A276899 Number of ordered set partitions of [n] such that for each block b the smallest integer interval containing b has at most nine elements.

Table of values

n a(n)
0 1
1 1
2 3
3 13
4 75
5 541
6 4683
7 47293
8 545835
9 7087261
10 95160302
11 1336605832
12 19761235784
13 308372439520
14 5082485111648
15 88427826212320
16 1622190325391504
17 31329432209039896
18 635929197472661444
19 13526250938401091568
20 300743675140836904032
21 6975365075051730713856

List of values

[1, 1, 3, 13, 75, 541, 4683, 47293, 545835, 7087261, 95160302, 1336605832, 19761235784, 308372439520, 5082485111648, 88427826212320, 1622190325391504, 31329432209039896, 635929197472661444, 13526250938401091568, 300743675140836904032, 6975365075051730713856]

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

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