OFFSET
0,2
EXAMPLE
if n=0 then C(3+2*0,3+0)*C(8+2*0,0+0)=C(3,3)*C(8,0)=1*1=1
if n=7 then C(3+2*7,3+7)*C(8+2*7,0+7)=C(17,10)*C(22,7)=19448*170544=3316739712
MATHEMATICA
Table[Binomial[3+2n, 3+n]Binomial[8+2n, n], {n, 0, 20}] (* Harvey P. Dale, Jul 26 2019 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Zerinvary Lajos, Feb 04 2006
EXTENSIONS
More terms from Harvey P. Dale, Jul 26 2019
STATUS
approved