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

Terms

a(0) =6a(1) =60a(2) =504a(3) =660a(4) =2730a(5) =2448a(6) =7980a(7) =6072a(8) =17550a(9) =12180a(10) =32736a(11) =21420a(12) =54834a(13) =34440a(14) =85140a(15) =51888a(16) =124950a(17) =74412a(18) =175560a(19) =102660a(20) =238266a(21) =137280a(22) =314364a(23) =178920a(24) =405150a(25) =228228a(26) =511920a(27) =285852a(28) =635970a(29) =352440