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A270959 Number of set partitions of [n] having exactly five pairs (m,m+1) such that m+1 is in some block b and m is in block b+1. 2
4, 127, 1856, 20074, 191967, 1753407, 15845905, 144101608, 1329935983, 12512797900, 120312183453, 1183814298898, 11928314725101, 123117825217659, 1301722909447207, 14096302961791594, 156301760858165116, 1773962132569829592, 20600385809700410195 (list; graph; refs; listen; history; text; internal format)
OFFSET

9,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 9..220

Wikipedia, Partition of a set

EXAMPLE

a(9) = 4: 1369|258|47, 136|259|48|7, 139|258|47|6, 159|248|37|6.

CROSSREFS

Column k=5 of A270953.

Sequence in context: A054053 A070781 A152421 * A291851 A128790 A267796

Adjacent sequences:  A270956 A270957 A270958 * A270960 A270961 A270962

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Mar 26 2016

STATUS

approved

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Last modified July 31 10:51 EDT 2021. Contains 346373 sequences. (Running on oeis4.)