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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.

A306416 Number of ordered set partitions of {1, ..., n} with no singletons or cyclical adjacencies (successive elements in the same block, where 1 is a successor of n).

Table of values

n a(n)
0 1
1 0
2 0
3 0
4 2
5 0
6 26
7 84
8 950
9 6000
10 62522
11 556116
12 6259598
13 69319848
14 874356338
15 11384093196
16 161462123894
17 2397736692144
18 37994808171962
19 631767062124564
20 11088109048500158
21 203828700127054008
22 3928762035148317314
23 79079452776283889820
24 1661265965479375937030
25 36332908076071038467520
26 826376466514358722894154

List of values

[1, 0, 0, 0, 2, 0, 26, 84, 950, 6000, 62522, 556116, 6259598, 69319848, 874356338, 11384093196, 161462123894, 2397736692144, 37994808171962, 631767062124564, 11088109048500158, 203828700127054008, 3928762035148317314, 79079452776283889820, 1661265965479375937030, 36332908076071038467520, 826376466514358722894154]

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

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