A127636 Hankel transform of C(3n,n), A005809.

1, 6, 99, 4590, 601749, 223671780, 236051526780, 707876792166456, 6035175245831686020, 146337688589606021286324, 10094030504239191283895044707, 1981045079056219549583047340549844

Offset: 0

Author

Paul Barry, Jan 21 2007

Keywords

• nonn

Formula

a(n)=3^n*A051255(n).