%I
%S 1,1,4,9,21,48,108,240,528,1152,2496,5376,11520,24576,52224,110592,
%T 233472,491520,1032192,2162688,4521984,9437184,19660800,40894464,
%U 84934656,176160768,364904448,754974720,1560281088,3221225472
%N Expansion of (13x+4x^23x^3+x^4)/(12x)^2.
%C Partial sums give A084860. Binomial transform of signed version of A008795.
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (4,4).
%F a(n) = 3(n+3)2^(n4), n>2.
%K easy,nonn
%O 0,3
%A _Paul Barry_, Jun 12 2003
