10021590358domain: NAppears in sequencesa(n) = a(n-1) + 4*a(n-2) - 4*a(n-3) for n > 2; a(0)=2, a(1)=3, a(2)=6.at n=33A137208Binomial transform of A169609.at n=32A168673a(n) = a(n-1) + 2*a(n-2) with a(0)=3, a(1)=4.at n=32A171160a(n) = (2 + 7*4^n)/3.at n=16A308124