%I
%S 2,30,2448,1265004,4368213360,106458751541142,19173684851378353296,
%T 26413015283743616538733008,285290979402099025600644272168880,
%U 24601033850235942230699563821233785600080
%N a(n) = n * C(2*3^(n1), n) for n>=1.
%C Equals column 1 of triangle A136635.
%F a(n) ~ 2^n * 3^(n*(n1)) / (n1)!.  _Vaclav Kotesovec_, Jul 02 2016
%p A136636:=n>n*binomial(2*3^(n1), n); seq(A136636(n), n=1..10); # _Wesley Ivan Hurt_, Apr 29 2014
%t Table[n*Binomial[2*3^(n  1), n], {n, 10}] (* _Wesley Ivan Hurt_, Apr 29 2014 *)
%o (PARI) {a(n)=n*binomial(2*3^(n1),n)}
%Y Cf. A136635 (triangle), A014070 (main diagonal), A136393 (column 0), A136637 (row sums), A136638 (antidiagonal sums).
%K nonn,easy
%O 1,1
%A _Vladeta Jovovic_ and _Paul D. Hanna_, Jan 15 2008
