a(n) = n * A006218(n).

Terms

a(0) =1a(1) =6a(2) =15a(3) =32a(4) =50a(5) =84a(6) =112a(7) =160a(8) =207a(9) =270a(10) =319a(11) =420a(12) =481a(13) =574a(14) =675a(15) =800a(16) =884a(17) =1044a(18) =1140a(19) =1320a(20) =1470a(21) =1628a(22) =1748a(23) =2016a(24) =2175a(25) =2366a(26) =2565a(27) =2828a(28) =2987a(29) =3330