a(n) = 4*A060819(n-2)*A060819(n+2).

Terms

a(0) =0a(1) =-12a(2) =-4a(3) =-12a(4) =0a(5) =20a(6) =12a(7) =84a(8) =8a(9) =180a(10) =60a(11) =308a(12) =24a(13) =468a(14) =140a(15) =660a(16) =48a(17) =884a(18) =252a(19) =1140a(20) =80a(21) =1428a(22) =396a(23) =1748a(24) =120a(25) =2100a(26) =572a(27) =2484a(28) =168a(29) =2900