a(n) = (2*n-8)^2 * 2^(n-3).

Terms

a(0) =8a(1) =9a(2) =8a(3) =4a(4) =0a(5) =16a(6) =128a(7) =576a(8) =2048a(9) =6400a(10) =18432a(11) =50176a(12) =131072a(13) =331776a(14) =819200a(15) =1982464a(16) =4718592a(17) =11075584a(18) =25690112a(19) =58982400a(20) =134217728a(21) =303038464a(22) =679477248a(23) =1514143744a(24) =3355443200a(25) =7398752256a(26) =16240345088a(27) =35500589056a(28) =77309411328a(29) =167772160000