|
Search: id:A052758
|
|
| |
|
| 0, 0, 0, 0, 24, 180, 1260, 9450, 77952, 709128, 7087440, 77398200, 918257472, 11771602128, 162251002368, 2393704535040, 37647052591104, 628913396701440, 11123162442408960, 207662678687208960
(list; graph; listen)
|
|
|
OFFSET
|
0,5
|
|
|
LINKS
|
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 714
|
|
FORMULA
|
E.g.f.: ln(-1/(-1+x))^3*x
Recurrence: {a(1)=0, a(2)=0, a(3)=0, a(4)=24, (4*n^4-n^6-7*n-9*n^2-3*n^5+6+10*n^3)*a(n)+(3*n^5+12*n^4+4*n^3-13*n^2+6*n)*a(n+1)+(-12*n^3-3*n^4-9*n^2)*a(n+2)+(n^3+3*n^2+2*n)*a(n+3)}
|
|
MAPLE
|
spec := [S, {B=Cycle(Z), S=Prod(B, B, B, Z)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
|
|
CROSSREFS
|
Sequence in context: A165187 A052761 A073993 this_sequence A143040 A128960 A047057
Adjacent sequences: A052755 A052756 A052757 this_sequence A052759 A052760 A052761
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
encyclopedia(AT)pommard.inria.fr, Jan 25 2000
|
|
|
Search completed in 0.002 seconds
|
