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
KEYWORD
sign
AUTHOR
Ralf Stephan, Sep 27 2013
STATUS
approved