a(n) = 109*n^2.

Terms

a(0) =0a(1) =109a(2) =436a(3) =981a(4) =1744a(5) =2725a(6) =3924a(7) =5341a(8) =6976a(9) =8829a(10) =10900a(11) =13189a(12) =15696a(13) =18421a(14) =21364a(15) =24525a(16) =27904a(17) =31501a(18) =35316a(19) =39349a(20) =43600a(21) =48069a(22) =52756a(23) =57661a(24) =62784a(25) =68125a(26) =73684a(27) =79461a(28) =85456a(29) =91669