|
Search: id:A052796
|
|
| |
|
| 0, 0, 0, 0, 24, 240, 1440, 6720, 26880, 96768, 322560, 1013760, 3041280, 8785920, 24600576, 67092480, 178913280, 467927040, 1203240960, 3048210432, 7620526080
(list; graph; listen)
|
|
|
OFFSET
|
0,5
|
|
|
LINKS
|
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 753
|
|
FORMULA
|
Recurrence: {a(1)=0, a(2)=0, a(3)=0, a(4)=24, (-2*n-2)*a(n)+(n-3)*a(n+1)}
|
|
MAPLE
|
spec := [S, {B=Set(Z), S=Prod(Z, Z, Z, Z, B, B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
|
|
CROSSREFS
|
Equals A090802(n, 4).
Sequence in context: A003245 A006863 A052663 this_sequence A056269 A000919 A014340
Adjacent sequences: A052793 A052794 A052795 this_sequence A052797 A052798 A052799
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
encyclopedia(AT)pommard.inria.fr, Jan 25 2000
|
|
|
Search completed in 0.002 seconds
|
