421401985024domain: NAppears in sequencesExtended Lucas L(n,i) = n*(L(n,i-1) + L(n,i-2)) = a^i + b^i where d = sqrt(n*(n+4)); a=(n+d)/2; b=(n-d)/2.at n=17A170931p-INVERT of (1,1,1,1,1,...), where p(S) = 1 - 6 S + S^2.at n=13A291018