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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.

A272434 Number of ordered set partitions of {1,2,...,n} such that no part has the same size as any of its six 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 5050276538344665
23 33326552998257031
24 186169293932977115
25 1305062351972825281
26 9600936552132048553
27 106019265737746665727
28 12708226588208611056333
29 98137877588880676995127

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, 5050276538344665, 33326552998257031, 186169293932977115, 1305062351972825281, 9600936552132048553, 106019265737746665727, 12708226588208611056333, 98137877588880676995127]

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

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