a(n) = 15n^2 + 13n^3.

Terms

a(0) =0a(1) =28a(2) =164a(3) =486a(4) =1072a(5) =2000a(6) =3348a(7) =5194a(8) =7616a(9) =10692a(10) =14500a(11) =19118a(12) =24624a(13) =31096a(14) =38612a(15) =47250a(16) =57088a(17) =68204a(18) =80676a(19) =94582a(20) =110000a(21) =127008a(22) =145684a(23) =166106a(24) =188352a(25) =212500a(26) =238628a(27) =266814a(28) =297136a(29) =329672