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A007975 Number of permutations that are 3 "block reversals" away from 12...n. +0
1
2, 55, 389, 1563, 4642 (list; graph; listen)
OFFSET

4,1
CROSSREFS

Adjacent sequences: A007972 A007973 A007974 this_sequence A007976 A007977 A007978

Sequence in context: A117681 A089180 A034013 this_sequence A109796 A024029 A134501

KEYWORD

nonn

AUTHOR

J. H. Conway (conway(AT)math.princeton.edu)

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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