626182695490domain: NAppears in sequencesa(n) = (Fibonacci(6*n+1) - 1)/4.at n=10A049661a(n+3) = 3*a(n+2) + 5*a(n+1) + a(n), a(0) = 0, a(1) = 1, a(2) = 3.at n=20A110526