Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A098995
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A098995 Number of permutations of [n] with exactly 4 descents which avoid the pattern 1324. +0
1
0, 0, 0, 0, 1, 57, 812, 6524, 37309, 169298, 648216, 2176923, 6582869, 18262399, 47129249, 114344261, 262987603, 577216181, 1215552037, 2467076907, 4843870146, 9229556242, 17113017451, 30949065535, 54705281270, 94677736245 (list; graph; listen)
OFFSET

1,6

FORMULA

G.f.: q^5*(-1-40*q+21*q^2+208*q^3-453*q^4+379*q^5-74*q^6-107*q^7+92*q^8-30*q^9+4*q^10)/(-1+q)^17

CROSSREFS

Cf. A061552, A000292.

Sequence in context: A166392 A084220 A060891 this_sequence A008390 A008922 A116181

Adjacent sequences: A098992 A098993 A098994 this_sequence A098996 A098997 A098998

KEYWORD

easy,nonn

AUTHOR

Mike Zabrocki (zabrocki(AT)mathstat.yorku.ca), Nov 05 2004

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified December 9 14:43 EST 2009. Contains 170430 sequences.


AT&T Labs Research