OFFSET
0,1
EXAMPLE
If n=0 then C(1+2*0,0+0)*C(6+2*0,1+0) = C(1,0)*C(6,1) = 1*6 = 6.
If n=4 then C(1+2*4,0+4)*C(6+2*4,1+4) = C(9,4)*C(14,5) = 126*2002 = 252252.
If n=10 then C(1+2*10,0+10)*C(6+2*10,1+10) = C(21,10)*C(26,11) = 352716*7726160 = 2725140250560.
MATHEMATICA
Table[Binomial[2n+1, n]Binomial[2n+6, n+1], {n, 0, 20}] (* Harvey P. Dale, Jun 14 2011 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Zerinvary Lajos, Jan 28 2006
EXTENSIONS
Edited by N. J. A. Sloane, Feb 03 2007
STATUS
approved