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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A151630 Number of permutations of 2 indistinguishable copies of 1..n with exactly 8 adjacent element pairs in decreasing order. 0
0, 1, 37257, 49258935, 19323413187, 3950966047950, 539417838175698 (list; graph; refs; listen; history; internal format)
OFFSET

4,3

CROSSREFS

Sequence in context: A057881 A206051 A112728 * A151840 A022245 A165284

Adjacent sequences:  A151627 A151628 A151629 * A151631 A151632 A151633

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 13 19:32 EST 2012. Contains 205536 sequences.