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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A151631 Number of permutations of 2 indistinguishable copies of 1..n with exactly 9 adjacent element pairs in decreasing order. 0
0, 716, 6030140, 6727188848, 2898916824320, 713977455470200 (list; graph; refs; listen; history; internal format)
OFFSET

5,2

CROSSREFS

Sequence in context: A030537 A140919 A200800 * A183841 A034587 A111416

Adjacent sequences:  A151628 A151629 A151630 * A151632 A151633 A151634

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) May 29 2009

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 15 20:26 EST 2012. Contains 205852 sequences.