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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.

A271792 Number of set partitions of [n] having exactly five pairs (m,m+1) such that m is in some block b and m+1 is in block b+1.

Table of values

n a(n)
5 0
6 1
7 21
8 242
9 2161
10 17081
11 127540
12 931343
13 6781012
14 49778592
15 370879817
16 2815885116
17 21840126520
18 173297901709
19 1407962621143
20 11717253906772
21 99896499620107
22 872434202618833
23 7803398795633086
24 71462039680103117
25 669812596793753200
26 6423126853283399476

List of values

[0, 1, 21, 242, 2161, 17081, 127540, 931343, 6781012, 49778592, 370879817, 2815885116, 21840126520, 173297901709, 1407962621143, 11717253906772, 99896499620107, 872434202618833, 7803398795633086, 71462039680103117, 669812596793753200, 6423126853283399476]

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

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