Duplicate of A022269.

Terms

a(0) =6a(1) =23a(2) =51a(3) =90a(4) =140a(5) =201a(6) =273a(7) =356a(8) =450a(9) =555a(10) =671a(11) =798a(12) =936a(13) =1085a(14) =1245a(15) =1416a(16) =1598a(17) =1791a(18) =1995a(19) =2210a(20) =2436a(21) =2673a(22) =2921a(23) =3180a(24) =3450a(25) =3731a(26) =4023a(27) =4326a(28) =4640a(29) =4965