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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.

A272433 Number of ordered set partitions of {1,2,...,n} such that no part has the same size as any of its five immediate predecessors.

Table of values

n a(n)
0 1
1 1
2 1
3 7
4 9
5 31
6 403
7 757
8 2873
9 12607
10 333051
11 761377
12 3699435
13 16383121
14 108710085
15 4855474267
16 13594184793
17 76375572751
18 388660153867
19 2504206435681
20 20148774553859
21 1556349601444477
22 10470804739432665
23 113472934257201031
24 1621680033815396315

List of values

[1, 1, 1, 7, 9, 31, 403, 757, 2873, 12607, 333051, 761377, 3699435, 16383121, 108710085, 4855474267, 13594184793, 76375572751, 388660153867, 2504206435681, 20148774553859, 1556349601444477, 10470804739432665, 113472934257201031, 1621680033815396315]

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

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