cp's OEIS Frontend

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.

A270956 Number of set partitions of [n] having exactly two pairs (m,m+1) such that m+1 is in some block b and m is in block b+1.

Table of values

n a(n)
5 3
6 27
7 159
8 857
9 4726
10 27385
11 167097
12 1071422
13 7203162
14 50674005
15 372321574
16 2851766861
17 22729523020
18 188191920799
19 1616005571254
20 14370046950779
21 132139869946194
22 1254871372262202
23 12292010800020819
24 124053806137088093
25 1288543305931949964

List of values

[3, 27, 159, 857, 4726, 27385, 167097, 1071422, 7203162, 50674005, 372321574, 2851766861, 22729523020, 188191920799, 1616005571254, 14370046950779, 132139869946194, 1254871372262202, 12292010800020819, 124053806137088093, 1288543305931949964]

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

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