Leading diagonal of triangle in A072467.

Terms

a(0) =2a(1) =5a(2) =19a(3) =53a(4) =151a(5) =211a(6) =463a(7) =673a(8) =1009a(9) =1231a(10) =2179a(11) =2593a(12) =3823a(13) =4649a(14) =5821a(15) =6977a(16) =9283a(17) =10369a(18) =14479a(19) =15901a(20) =18397a(21) =20549a(22) =25301a(23) =27073a(24) =32251a(25) =35569a(26) =40879a(27) =44017a(28) =53419a(29) =55681