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

4,1

CROSSREFS

Sequence in context: A089180 A034013 A157262 * A109796 A186886 A024029

Adjacent sequences:  A007972 A007973 A007974 * A007976 A007977 A007978

KEYWORD

nonn

AUTHOR

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

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.