a(n) = 34*n^2.

Terms

a(0) =0a(1) =34a(2) =136a(3) =306a(4) =544a(5) =850a(6) =1224a(7) =1666a(8) =2176a(9) =2754a(10) =3400a(11) =4114a(12) =4896a(13) =5746a(14) =6664a(15) =7650a(16) =8704a(17) =9826a(18) =11016a(19) =12274a(20) =13600a(21) =14994a(22) =16456a(23) =17986a(24) =19584a(25) =21250a(26) =22984a(27) =24786a(28) =26656a(29) =28594