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A055968
Product_{i=1..n} (i-1)!*(i+2*n-1)!/(i+n-1)!.
1
1, 2, 240, 16934400, 2433481408512000, 1702585913798082900787200000, 11371604489970305906683404111524659200000000, 1255487625657168098911809977092685237691748290920448000000000000
OFFSET
0,2
MAPLE
A055968 := proc(n) local i; mul( (i-1)!*(i+2*n-1)!/(i+n-1)!, i=1..n); end;
CROSSREFS
Sequence in context: A024348 A006523 A294319 * A068838 A074256 A146312
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 22 2000
STATUS
approved