a(n) = [ 2nd elementary symmetric function of {log(k)} ], k = 2,3,...,n.

Terms

a(0) =0a(1) =3a(2) =8a(3) =16a(4) =29a(5) =47a(6) =70a(7) =100a(8) =136a(9) =179a(10) =231a(11) =290a(12) =358a(13) =436a(14) =523a(15) =620a(16) =727a(17) =845a(18) =973a(19) =1114a(20) =1266a(21) =1430a(22) =1606a(23) =1795a(24) =1997a(25) =2212a(26) =2441a(27) =2683a(28) =2939a(29) =3210