Main diagonal of A332357.

Terms

a(0) =1a(1) =5a(2) =17a(3) =47a(4) =105a(5) =215a(6) =381a(7) =649a(8) =1029a(9) =1563a(10) =2257a(11) =3209a(12) =4385a(13) =5925a(14) =7793a(15) =10053a(16) =12745a(17) =16061a(18) =19881a(19) =24487a(20) =29749a(21) =35799a(22) =42649a(23) =50649a(24) =59545a(25) =69701a(26) =80993a(27) =93655a(28) =107597a(29) =123375