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

Terms

a(0) =1a(1) =1a(2) =7a(3) =14a(4) =42a(5) =42a(6) =462a(7) =66a(8) =429a(9) =1001a(10) =1001a(11) =364a(12) =6188a(13) =1428a(14) =3876a(15) =3876a(16) =6783a(17) =4389a(18) =33649a(19) =3542a(20) =17710a(21) =32890a(22) =26910a(23) =8190a(24) =118755a(25) =23751a(26) =56637a(27) =50344a(28) =79112a(29) =46376