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A286433 Number of entries in the second last blocks of all set partitions of [n]. 2
1, 6, 25, 98, 399, 1746, 8271, 42284, 231939, 1357128, 8427181, 55288860, 381798629, 2765917074, 20960284277, 165729739590, 1364153612299, 11665484410094, 103448316470723, 949739632313480, 9013431476894623, 88304011710168668, 891917738589610553 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 2..250

Wikipedia, Partition of a set

EXAMPLE

a(3) = 6 because the number of entries in the second last blocks of all set partitions of [3] (123, 12|3, 13|2, 1|23, 1|2|3) is 0+2+2+1+1 = 6.

CROSSREFS

Column k=2 of A286416.

Sequence in context: A291230 A092184 A214955 * A034559 A034347 A009121

Adjacent sequences:  A286430 A286431 A286432 * A286434 A286435 A286436

KEYWORD

nonn

AUTHOR

Alois P. Heinz, May 09 2017

STATUS

approved

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Last modified April 18 22:08 EDT 2019. Contains 322237 sequences. (Running on oeis4.)