Partial sums of A365412.

Terms

a(0) =3a(1) =18a(2) =42a(3) =84a(4) =126a(5) =189a(6) =249a(7) =333a(8) =426a(9) =546a(10) =642a(11) =768a(12) =882a(13) =1068a(14) =1200a(15) =1368a(16) =1539a(17) =1749a(18) =1965a(19) =2175a(20) =2361a(21) =2616a(22) =2820a(23) =3156a(24) =3378a(25) =3678a(26) =3918a(27) =4212a(28) =4536a(29) =4908