a(n) = (2*(3*2^(n-1)-1))^2.

Terms

a(0) =1a(1) =16a(2) =100a(3) =484a(4) =2116a(5) =8836a(6) =36100a(7) =145924a(8) =586756a(9) =2353156a(10) =9424900a(11) =37724164a(12) =150945796a(13) =603881476a(14) =2415722500a(15) =9663283204a(16) =38653919236a(17) =154617249796a(18) =618472144900