167788domain: NAppears in sequencesa(n) = L(n+2) + c(n) where L(k) is the k-th Lucas number and c(n) is the n-th number that is 1 or 3 or is not a Lucas number.at n=22A022810Expansion of 1/(x^k*(1-x-3*x^(k+1))) for k=8.at n=39A143459