a(n) = lpf(n) * lpf(n+1) * lpf(n+2), where lpf(n) = A020639(n) is the least prime factor of n.

Terms

a(0) =6a(1) =12a(2) =30a(3) =20a(4) =70a(5) =28a(6) =42a(7) =12a(8) =66a(9) =44a(10) =286a(11) =52a(12) =78a(13) =12a(14) =102a(15) =68a(16) =646a(17) =76a(18) =114a(19) =12a(20) =138a(21) =92a(22) =230a(23) =20a(24) =30a(25) =12a(26) =174a(27) =116a(28) =1798a(29) =124