%I #2 Mar 30 2012 18:58:54
%S 1,3,9,63,555,6303,87381,1434891,27272727,589486923,14288622513,
%T 384034370151,11338782475059,364911575317383,12716046006693165,
%U 477070508584969299,19174662804725408175,822058028667720327891
%N 0^n+3((n+2)^n/(n+3)-(-1)^n/(n+3)).
%Y Cf. A083063.
%K easy,nonn
%O 0,2
%A _Paul Barry_, Feb 03 2004