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A229625
H(2^n) with H(n) the Hankel transform of A007814.
2
-1, 9, 441, 893025, 3406183992225, 47917474281481550923130625, 9330699003355695519378770695858918148510783562890625
OFFSET
1,2
COMMENTS
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.
FORMULA
a(0) = -1, a(n) = A144621(n)^2.
PROG
(PARI) hankel(v, n)=matdet(matrix(n, n, i, j, v[i+j-1]));
a(n)=hankel(vector(2*2^n, k, valuation(k, 2)), 2^n);
CROSSREFS
Sequence in context: A287102 A173954 A239479 * A196965 A069073 A156086
KEYWORD
sign
AUTHOR
Ralf Stephan, Sep 27 2013
STATUS
approved