a(n) = lcm(n,n+1,n+2,n+3,n+4,n+5)/60.

Terms

a(0) =0a(1) =1a(2) =7a(3) =14a(4) =42a(5) =42a(6) =462a(7) =462a(8) =858a(9) =3003a(10) =1001a(11) =4004a(12) =6188a(13) =18564a(14) =27132a(15) =3876a(16) =27132a(17) =74613a(18) =100947a(19) =67298a(20) =17710a(21) =230230a(22) =296010a(23) =188370a(24) =237510a(25) =118755a(26) =736281a(27) =453096a(28) =553784a(29) =1344904