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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.

A327504 Number of set partitions of [n] where each subset is again partitioned into three nonempty subsets.

Table of values

n a(n)
0 1
1 0
2 0
3 1
4 6
5 25
6 100
7 511
8 3626
9 29765
10 250200
11 2146771
12 19575446
13 195336505
14 2124840900
15 24646324431
16 299803782466
17 3809251939245
18 50698296967600
19 708349718638891
20 10372758309704686
21 158546862369781985
22 2519789706502636700
23 41545703617137280551

List of values

[1, 0, 0, 1, 6, 25, 100, 511, 3626, 29765, 250200, 2146771, 19575446, 195336505, 2124840900, 24646324431, 299803782466, 3809251939245, 50698296967600, 708349718638891, 10372758309704686, 158546862369781985, 2519789706502636700, 41545703617137280551]

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

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