a(n) = 576*n^2 + 24.

Terms

a(0) =24a(1) =600a(2) =2328a(3) =5208a(4) =9240a(5) =14424a(6) =20760a(7) =28248a(8) =36888a(9) =46680a(10) =57624a(11) =69720a(12) =82968a(13) =97368a(14) =112920a(15) =129624a(16) =147480a(17) =166488a(18) =186648a(19) =207960a(20) =230424a(21) =254040a(22) =278808a(23) =304728a(24) =331800a(25) =360024a(26) =389400a(27) =419928a(28) =451608a(29) =484440