a(n) = ( n*(n+2) )^2.

Terms

a(0) =0a(1) =9a(2) =64a(3) =225a(4) =576a(5) =1225a(6) =2304a(7) =3969a(8) =6400a(9) =9801a(10) =14400a(11) =20449a(12) =28224a(13) =38025a(14) =50176a(15) =65025a(16) =82944a(17) =104329a(18) =129600a(19) =159201a(20) =193600a(21) =233289a(22) =278784a(23) =330625a(24) =389376a(25) =455625a(26) =529984a(27) =613089a(28) =705600a(29) =808201