OFFSET
0,2
COMMENTS
FORMULA
EXAMPLE
PROG
(PARI) {a(n)=if(n==0, 1, 1+sum(k=0, n-1, binomial(n, k)*a(subst(Pol(binary(n-k-1)), x, 1))))}
CROSSREFS
KEYWORD
eigen,nonn
AUTHOR
Paul D. Hanna, Dec 21 2004
STATUS
approved