A227474 - OEIS

%I #5 Jul 13 2013 08:20:05

%S 1,1,9,27,189,729,24057,104247,938223,4349943,82648917,400529367,

%T 3948075189,19740375945,1598970451545,8182966428495,84557319761115

%N Denominator/27 of hypergeom([n+1/2,1],[n+3],-3).

%C For numerator/2 of hypergeom([n+1/2,1],[n+3],-3) see A227473.

%p seq(denom(simplify(hypergeom([n+1/2,1],[n+3],-3)))/27,n=0..16)

%Y Cf. A227473.

%K nonn,frac

%O 0,3

%A _Karol A. Penson_, Jul 13 2013