17179867136domain: NAppears in sequencesa(n) = 10*a(n-2) - 16*a(n-4) for n > 3, a(0) = 1, a(1) = 5, a(2) = 14, a(3) = 34.at n=22A083332Numbers whose binary representation is the concatenation of 2n-1 digits 1 and n-1 digits 0.at n=11A147590