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

Terms

a(0) =1a(1) =6a(2) =21a(3) =54a(4) =116a(5) =220a(6) =383a(7) =623a(8) =962a(9) =1424a(10) =2034a(11) =2821a(12) =3817a(13) =5053a(14) =6565a(15) =8391a(16) =10569a(17) =13142a(18) =16153a(19) =19646a(20) =23671a(21) =28274a(22) =33509a(23) =39426a(24) =46082a(25) =53533a(26) =61836a(27) =71051a(28) =81240a(29) =92466