a(n) = 16*n*(n+1)*(2*n+1)^2.

Terms

a(0) =0a(1) =288a(2) =2400a(3) =9408a(4) =25920a(5) =58080a(6) =113568a(7) =201600a(8) =332928a(9) =519840a(10) =776160a(11) =1117248a(12) =1560000a(13) =2122848a(14) =2825760a(15) =3690240a(16) =4739328a(17) =5997600a(18) =7491168a(19) =9247680a(20) =11296320a(21) =13667808a(22) =16394400a(23) =19509888a(24) =23049600a(25) =27050400a(26) =31550688a(27) =36590400a(28) =42211008a(29) =48455520