38217domain: NAppears in sequencesSum of GCD's of parts in all partitions of n.at n=39A078392Expansion of (5+4x)/(1-2x-x^2).at n=10A105082a(0)=-3, a(1)=4; thereafter a(n) = 2*a(n-1) + a(n-2).at n=12A221173