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A320615
Number of ordered set partitions of [n] where k = two is minimal such that for each block b the smallest integer interval containing b has at most k elements.
2
1, 4, 20, 114, 750, 5616, 47304, 443400, 4582200, 51790320, 635791680, 8426915280, 119960552880, 1825701857280, 29585590473600, 508653914267520, 9248148480574080, 177303557272262400, 3574966680853747200, 75628468328518828800, 1675003757666567328000
OFFSET
2,2
LINKS
CROSSREFS
Column k=2 of A276891.
Sequence in context: A346414 A028475 A128327 * A316298 A291531 A171802
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 17 2018
STATUS
approved