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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.

A323949 Number of set partitions of {1, ..., n} with no block containing three distinct cyclically successive vertices.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 10
5 36
6 145
7 631
8 3015
9 15563
10 86144
11 508311
12 3180930
13 21018999
14 146111543
15 1065040886
16 8117566366
17 64531949885
18 533880211566
19 4587373155544
20 40865048111424
21 376788283806743
22 3590485953393739
23 35312436594162173
24 357995171351223109
25 3736806713651177702

List of values

[1, 1, 2, 4, 10, 36, 145, 631, 3015, 15563, 86144, 508311, 3180930, 21018999, 146111543, 1065040886, 8117566366, 64531949885, 533880211566, 4587373155544, 40865048111424, 376788283806743, 3590485953393739, 35312436594162173, 357995171351223109, 3736806713651177702]

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

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