(n+4)^3 - n^3.

Terms

a(0) =124a(1) =208a(2) =316a(3) =448a(4) =604a(5) =784a(6) =988a(7) =1216a(8) =1468a(9) =1744a(10) =2044a(11) =2368a(12) =2716a(13) =3088a(14) =3484a(15) =3904a(16) =4348a(17) =4816a(18) =5308a(19) =5824a(20) =6364a(21) =6928a(22) =7516a(23) =8128a(24) =8764a(25) =9424a(26) =10108a(27) =10816a(28) =11548a(29) =12304