a(n) = 12*a(n-2) for n > 2; a(1) = 1, a(2) = 8.

Terms

a(0) =1a(1) =8a(2) =12a(3) =96a(4) =144a(5) =1152a(6) =1728a(7) =13824a(8) =20736a(9) =165888a(10) =248832a(11) =1990656a(12) =2985984a(13) =23887872a(14) =35831808a(15) =286654464a(16) =429981696a(17) =3439853568a(18) =5159780352a(19) =41278242816a(20) =61917364224a(21) =495338913792a(22) =743008370688