83098domain: NAppears in sequencesa(n) = ceiling((3-sqrt(3))*4^(n-3)) + 1 for n>=2, a(1)=1.at n=10A094062a(n) = ceiling((3-sqrt(3))*4^(n-3)) + 1.at n=11A101360Alternating sum of Motzkin numbers A001006.at n=14A187306