a(n) = n^6 * Product_{p|n, p prime} (1 + 1/p^6).

Terms

a(0) =1a(1) =65a(2) =730a(3) =4160a(4) =15626a(5) =47450a(6) =117650a(7) =266240a(8) =532170a(9) =1015690a(10) =1771562a(11) =3036800a(12) =4826810a(13) =7647250a(14) =11406980a(15) =17039360a(16) =24137570a(17) =34591050a(18) =47045882a(19) =65004160a(20) =85884500a(21) =115151530a(22) =148035890a(23) =194355200a(24) =244156250a(25) =313742650a(26) =387951930a(27) =489424000a(28) =594823322a(29) =741453700