A229625 H(2^n) with H(n) the Hankel transform of A007814.

-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.

Links

Table of n, a(n) for n=1..7.

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

Adjacent sequences: A229622 A229623 A229624 * A229626 A229627 A229628

Keyword

sign

Author

Ralf Stephan, Sep 27 2013

Status

approved