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0^n+3((n+2)^n/(n+3)-(-1)^n/(n+3)).
0

%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