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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.

A328153 Number of set partitions of [n] such that at least one of the block sizes is 3.

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 4
5 20
6 90
7 455
8 2352
9 13132
10 76540
11 473660
12 3069220
13 20922330
14 149021600
15 1109629885
16 8604815520
17 69437698160
18 581661169640
19 5051885815603
20 45411759404560
21 421977921782270
22 4047693372023070
23 40034523497947132
24 407818256494533984
25 4274309903558446900

List of values

[0, 0, 0, 1, 4, 20, 90, 455, 2352, 13132, 76540, 473660, 3069220, 20922330, 149021600, 1109629885, 8604815520, 69437698160, 581661169640, 5051885815603, 45411759404560, 421977921782270, 4047693372023070, 40034523497947132, 407818256494533984, 4274309903558446900]

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

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