1 / min{1/n - 1/a - 1/b > 0}, where a and b are integers.

Terms

a(0) =6a(1) =20a(2) =120a(3) =140a(4) =630a(5) =231a(6) =2016a(7) =2184a(8) =4950a(9) =2860a(10) =10296a(11) =8364a(12) =19110a(13) =9520a(14) =32640a(15) =15504a(16) =52326a(17) =34362a(18) =79800a(19) =35420a(20) =116886a(21) =70686a(22) =165600a(23) =28536a(24) =228150a(25) =95004a(26) =306936a(27) =170940a(28) =404550a(29) =117030