|
|
|
|
1, 4, 40, 580, 10560, 226560, 5532960, 150570240, 4501422240, 146351879520, 5135738294400, 193376042294400, 7775407679034240, 332528365742227200, 15073953619379719680, 722117116504240994880, 36458486578829035929600
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
FORMULA
|
G.f.: A(x) = 1 + 4x*R(x,4)^2, where R(x,4) = 1 + 5*x*R(x,5)^2, R(x,5) = 1 + 6*x*R(x,6)^2, ..., R(x,n) = 1 + (n+1)*x*R(x,n+1)^2, ... and R(x,n) is the g.f. of row n of table A128570.
|
|
PROG
|
(PARI) {a(n)=local(A=1+(n+4)*x); for(j=0, n, A=1+(n+4-j)*x*A^2 +x*O(x^n)); polcoeff(A, n)}
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|