a(n) = [ 3rd elementary symmetric function of {sqrt(k)} ], k = 1,2,...,n.

Terms

a(0) =2a(1) =13a(2) =44a(3) =112a(4) =239a(5) =457a(6) =801a(7) =1320a(8) =2066a(9) =3103a(10) =4504a(11) =6354a(12) =8744a(13) =11779a(14) =15576a(15) =20260a(16) =25971a(17) =32861a(18) =41093a(19) =50844a(20) =62304a(21) =75678a(22) =91183a(23) =109050a(24) =129526a(25) =152874a(26) =179367a(27) =209300a(28) =242978a(29) =280725