a(n)= n * reversal(n-1) * reversal(n+1).

Terms

a(0) =0a(1) =6a(2) =24a(3) =60a(4) =120a(5) =210a(6) =336a(7) =504a(8) =72a(9) =990a(10) =231a(11) =4092a(12) =11193a(13) =22134a(14) =37515a(15) =57936a(16) =83997a(17) =116298a(18) =3078a(19) =21840a(20) =924a(21) =8448a(22) =21252a(23) =39936a(24) =65100a(25) =97344a(26) =137268a(27) =185472a(28) =7134a(29) =35880