OFFSET
0,2
COMMENTS
Combinatorial interpretation welcome.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
FORMULA
G.f. is equivalent to (-1 + 2F1(-3/2,-1/2;2;16*x) - 6*x*2F1(-1/2,1/2;3;16*x) )/(4*x^2).
a(n) = C(2*n,n)*C(2*n+2,n)/C(n+3,3). - Vaclav Kotesovec, Oct 28 2012
D-finite with recurrence +n*(n+3)*(n+2)*a(n) -4*(2*n+1)*(2*n-1)*(n+1)*a(n-1)=0. - R. J. Mathar, Feb 08 2021
MATHEMATICA
CoefficientList[Series[HypergeometricPFQ[{2, 1/2, 3/2}, {3, 4}, 16*x], {x, 0, 20}], x]
Table[Binomial[2*n, n]*Binomial[2*n+2, n]/Binomial[n+3, 3], {n, 0, 20}] (* Vaclav Kotesovec, Oct 28 2012 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Olivier Gérard, Feb 16 2011
STATUS
approved