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%I #3 Mar 30 2012 18:36:59
%S 1,1,6,84,2010,70596,3331006,199417056,14559631506,1259526351000,
%T 126308710634414,14434568970310656,1854260500658184762,
%U 264771440776810595320,41635233706865669566110
%N a(n) = A123311(n)/(n+1), where A123311 forms the central terms of triangle A123305.
%C Triangle T=A123305 is defined by: (column k of T) = (k+1)*(column k of T^2) shifted to have an initial '1'; thus a(n) = A123311(n)/(n+1) is integer for n>=0.
%Y Cf. A123305; A123306, A123307, A123308, A123309, A123310, A123311.
%K nonn
%O 0,3
%A _Paul D. Hanna_, Sep 25 2006
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