a(n) = [ 2nd elementary symmetric function of {sqrt(k)} ], k = 1,2,...,n.

Terms

a(0) =1a(1) =5a(2) =13a(3) =27a(4) =48a(5) =76a(6) =114a(7) =163a(8) =224a(9) =299a(10) =388a(11) =494a(12) =617a(13) =758a(14) =920a(15) =1104a(16) =1310a(17) =1540a(18) =1796a(19) =2078a(20) =2389a(21) =2729a(22) =3100a(23) =3504a(24) =3940a(25) =4412a(26) =4919a(27) =5464a(28) =6048a(29) =6672