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A007973 Number of permutations that are n-2 "block reversals" away from 12...n. 3
1, 3, 15, 55, 184, 648, 2111 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..8.

CROSSREFS

Cf. A007972, A007974, A007975.

Sequence in context: A119113 A286185 A152896 * A261737 A015249 A084152

Adjacent sequences:  A007970 A007971 A007972 * A007974 A007975 A007976

KEYWORD

nonn,more

AUTHOR

J. H. Conway

STATUS

approved

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Last modified February 20 19:06 EST 2018. Contains 299382 sequences. (Running on oeis4.)