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A287257 Number of set partitions of [n] such that all absolute differences between least elements of consecutive blocks are <= seven. 4
1, 1, 2, 5, 15, 52, 203, 877, 4140, 21146, 115843, 675473, 4168497, 27104931, 185021744, 1321754226, 9855001715, 76507188271, 617104691644, 5161680552010, 44693782407111, 399989835781046, 3694733749868820, 35179653387299934, 344876641013083336 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..580

Wikipedia, Partition of a set

FORMULA

a(n) = A287216(n,7).

a(n) = A000110(n) for n <= 8.

CROSSREFS

Column k=7 of A287216.

Cf. A000110.

Sequence in context: A276724 A287586 A287279 * A287669 A099263 A192865

Adjacent sequences:  A287254 A287255 A287256 * A287258 A287259 A287260

KEYWORD

nonn

AUTHOR

Alois P. Heinz, May 22 2017

STATUS

approved

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Last modified August 3 15:40 EDT 2020. Contains 336200 sequences. (Running on oeis4.)