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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.

A320557 Number of set partitions of [n] such that for each block b the smallest integer interval containing b has at most seven elements and for at least one block c the smallest integer interval containing c has exactly seven elements.

Table of values

n a(n)
7 203
8 1197
9 4971
10 18223
11 63768
12 220419
13 779242
14 2845864
15 10418560
16 37768970
17 135153976
18 477964329
19 1676343822
20 5852483376
21 20403590238
22 71080014610
23 247360604490
24 859493636214
25 2980904955378
26 10318666659192
27 35656973487023
28 123042978647274
29 424121272321296

List of values

[203, 1197, 4971, 18223, 63768, 220419, 779242, 2845864, 10418560, 37768970, 135153976, 477964329, 1676343822, 5852483376, 20403590238, 71080014610, 247360604490, 859493636214, 2980904955378, 10318666659192, 35656973487023, 123042978647274, 424121272321296]

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

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