Partial sums of the even triangular numbers (A014494).

Terms

a(0) =0a(1) =6a(2) =16a(3) =44a(4) =80a(5) =146a(6) =224a(7) =344a(8) =480a(9) =670a(10) =880a(11) =1156a(12) =1456a(13) =1834a(14) =2240a(15) =2736a(16) =3264a(17) =3894a(18) =4560a(19) =5340a(20) =6160a(21) =7106a(22) =8096a(23) =9224a(24) =10400a(25) =11726a(26) =13104a(27) =14644a(28) =16240a(29) =18010