Sums of members of groups in A076063.

Terms

a(0) =4a(1) =6a(2) =16a(3) =36a(4) =60a(5) =120a(6) =168a(7) =270a(8) =368a(9) =504a(10) =660a(11) =882a(12) =1100a(13) =1392a(14) =1700a(15) =2054a(16) =2457a(17) =2912a(18) =3450a(19) =4000a(20) =4653a(21) =5338a(22) =6090a(23) =6912a(24) =7828a(25) =8814a(26) =9840a(27) =11004a(28) =12232a(29) =13500