Leading diagonal of A083173.

Terms

a(0) =2a(1) =9a(2) =15a(3) =42a(4) =55a(5) =117a(6) =119a(7) =228a(8) =207a(9) =435a(10) =341a(11) =666a(12) =533a(13) =903a(14) =705a(15) =1272a(16) =1003a(17) =1647a(18) =1273a(19) =2130a(20) =1533a(21) =2607a(22) =1909a(23) =3204a(24) =2425a(25) =3939a(26) =2781a(27) =4494a(28) =3161a(29) =5085