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%I #8 Sep 28 2013 03:20:11
%S -1,9,441,893025,3406183992225,47917474281481550923130625,
%T 9330699003355695519378770695858918148510783562890625
%N H(2^n) with H(n) the Hankel transform of A007814.
%C Determinant of the 2^n x 2^n matrix M, where M(i,j) = exponent of 2 in the factorization of i+j-1 = A007814(i+j-1), i,j>0.
%F a(0) = -1, a(n) = A144621(n)^2.
%o (PARI) hankel(v,n)=matdet(matrix(n,n,i,j,v[i+j-1]));
%o a(n)=hankel(vector(2*2^n,k,valuation(k,2)),2^n);
%K sign
%O 1,2
%A _Ralf Stephan_, Sep 27 2013
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