OFFSET
0,3
COMMENTS
[x^n] 1/(1-x)^(1/2^n) denotes the coefficient of x^n in the (2^n)-root of 1/(1-x).
PROG
(PARI) {a(n)=polcoeff(1/(1-x+x*O(x^n))^(1/2^n), n)*2^(n*(n+1)-subst(Pol(binary(n)), x, 1))}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Oct 26 2007
STATUS
approved