112812130561domain: NAppears in sequencesa(n) = a(n-1)*2^n + 1 where a(0)=1.at n=8A073587a(n) = Sum_{k=0..floor(n/2)} 2^((n-2*k)*k) for n>=0.at n=17A117403Duplicate of A073587.at n=8A182104