login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A007973 Number of permutations that are n-2 "block reversals" away from 12...n. 0
1, 3, 15, 55, 184, 648, 2111 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

CROSSREFS

Sequence in context: A176288 A119113 A152896 * A015249 A084152 A084175

Adjacent sequences:  A007970 A007971 A007972 * A007974 A007975 A007976

KEYWORD

nonn

AUTHOR

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 17 06:27 EST 2012. Contains 205998 sequences.