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%I #2 Mar 30 2012 18:37:15
%S 1,4,-240,103168,-235382784,2419300630528,-70623685744001024,
%T -24014437599659889262592,3308941680089784176592551936,
%U 8054447269307712030842365568916389888
%N Column 2 of triangle A152790.
%C G.f. of row n of matrix power A152790^n = (2^(2n-1) + y)*y^(n-1) for n>0.
%K sign
%O 0,2
%A _Paul D. Hanna_, Dec 18 2008