a(n) = (7*n+3)*(7*n+5)*(7*n+6).

Terms

a(0) =90a(1) =1560a(2) =6460a(3) =16848a(4) =34782a(5) =62320a(6) =101520a(7) =154440a(8) =223138a(9) =309672a(10) =416100a(11) =544480a(12) =696870a(13) =875328a(14) =1081912a(15) =1318680a(16) =1587690a(17) =1891000a(18) =2230668a(19) =2608752a(20) =3027310a(21) =3488400a(22) =3994080a(23) =4546408a(24) =5147442a(25) =5799240a(26) =6503860a(27) =7263360a(28) =8079798a(29) =8955232