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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..7.

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 * A074256 A146312 A109930

Adjacent sequences:  A055965 A055966 A055967 * A055969 A055970 A055971

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jul 22 2000

STATUS

approved

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Last modified May 7 10:15 EDT 2021. Contains 343649 sequences. (Running on oeis4.)