|
Search: id:A052786
|
|
| |
|
| 0, 0, 0, 0, 0, 0, 720, 7560, 70560, 680400, 7015680, 78004080, 935542080, 12074119200, 167122859904, 2472036446880, 38940240568320, 651087633530880, 11519998092877824, 215088381671892480
(list; graph; listen)
|
|
|
OFFSET
|
0,7
|
|
|
LINKS
|
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 743
|
|
FORMULA
|
E.g.f.: x^3*ln(-1/(-1+x))^3
Recurrence: {a(1)=0, a(2)=0, a(4)=0, a(3)=0, a(5)=0, a(6)=720, (16*n^4+135*n+162-81*n^2-42*n^3-n^6+3*n^5)*a(n)+(-228+81*n^2+3*n^5+104*n-38*n^3-6*n^4)*a(n+1)+(36+6*n^3-3*n^4+21*n^2-60*n)*a(n+2)+(-3*n^2+n^3+2*n)*a(n+3)}
|
|
MAPLE
|
spec := [S, {B=Cycle(Z), S=Prod(Z, Z, Z, B, B, B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
|
|
CROSSREFS
|
Sequence in context: A029574 A119540 A052784 this_sequence A052792 A052790 A052521
Adjacent sequences: A052783 A052784 A052785 this_sequence A052787 A052788 A052789
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
encyclopedia(AT)pommard.inria.fr, Jan 25 2000
|
|
|
Search completed in 0.002 seconds
|
