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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.

A327505 Number of set partitions of [n] where each subset is again partitioned into four nonempty subsets.

Table of values

n a(n)
0 1
1 0
2 0
3 0
4 1
5 10
6 65
7 350
8 1736
9 9030
10 60355
11 561550
12 6183221
13 69469400
14 761767370
15 8239194600
16 91058524831
17 1073790441370
18 13900626022985
19 196759304278250
20 2963381404815566
21 46227649788125190
22 736940002561065325
23 12005645243802471250
24 201482801573414254301

List of values

[1, 0, 0, 0, 1, 10, 65, 350, 1736, 9030, 60355, 561550, 6183221, 69469400, 761767370, 8239194600, 91058524831, 1073790441370, 13900626022985, 196759304278250, 2963381404815566, 46227649788125190, 736940002561065325, 12005645243802471250, 201482801573414254301]

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

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