Main diagonal of A332359.

Terms

a(0) =3a(1) =10a(2) =30a(3) =82a(4) =180a(5) =374a(6) =656a(7) =1126a(8) =1784a(9) =2726a(10) =3916a(11) =5582a(12) =7628a(13) =10354a(14) =13592a(15) =17542a(16) =22212a(17) =28042a(18) =34672a(19) =42762a(20) =51964a(21) =62614a(22) =74496a(23) =88510a(24) =104044a(25) =121914a(26) =141536a(27) =163666a(28) =187944a(29) =215638