77283962750domain: NAppears in sequencesa(n) = a(n) = +13*a(n-2) +7*a(n-3) -47*a(n-4) -38*a(n-5) +48*a(n-6) +43*a(n-7) -7*a(n-8) -1*a(n-9).at n=21A134325