Main diagonal of A082043: a(n) = n^4 + 2*n^2 + 1.

Terms

a(0) =1a(1) =4a(2) =25a(3) =100a(4) =289a(5) =676a(6) =1369a(7) =2500a(8) =4225a(9) =6724a(10) =10201a(11) =14884a(12) =21025a(13) =28900a(14) =38809a(15) =51076a(16) =66049a(17) =84100a(18) =105625a(19) =131044a(20) =160801a(21) =195364a(22) =235225a(23) =280900a(24) =332929a(25) =391876a(26) =458329a(27) =532900a(28) =616225a(29) =708964