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A007972 Number of permutations that are 2 "block reversals" away from 12...n. +0
1
2, 15, 52, 129, 266, 487 (list; graph; listen)
OFFSET

3,1
CROSSREFS

Sequence in context: A116693 A066562 A073877 this_sequence A015520 A098520 A056078

Adjacent sequences: A007969 A007970 A007971 this_sequence A007973 A007974 A007975

KEYWORD

nonn

AUTHOR

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

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Last modified December 4 12:27 EST 2008. Contains 151280 sequences.

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