1356970471domain: NAppears in sequencesa(n) = Pell(n) * Sum_{d|n} 1/Pell(d), where Pell(n) = A000129(n).at n=24A203797a(n) = Pell(n) * Sum_{d|n} (-1)^(n/d) / Pell(d), where Pell(n) = A000129(n).at n=24A204059