OFFSET
1,2
FORMULA
a(1)=1; for n>=2, a(n) = 2*A014577(n-1)+1
PROG
(PARI) a(n)=numerator(2/n*(4^n-1)*bernfrac(2*n))%4
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Dec 30 2003
STATUS
approved