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%I #3 Mar 30 2012 18:36:59
%S 1,1,2,6,26,156,1234,12340,150994,2204112,37617314,738465620,
%T 16451763834,411281292920,11427727238034,350040470610996,
%U 11736423864328466,428080429306305136,16893650334361392866
%N Column 0 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 this sequence shift left equals column 0 of T^2.
%Y Cf. A123305; A123307, A123308, A123309; A123310, A123311.
%K nonn
%O 0,3
%A _Paul D. Hanna_, Sep 24 2006