a(n) = LCM of the integers, from n/2 to n, which are coprime to n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =12a(5) =5a(6) =60a(7) =35a(8) =280a(9) =63a(10) =2520a(11) =77a(12) =27720a(13) =1287a(14) =8008a(15) =6435a(16) =720720a(17) =2431a(18) =12252240a(19) =46189a(20) =3695120a(21) =440895a(22) =232792560a(23) =96577a(24) =1070845776a(25) =3900225a(26) =2974571600a(27) =5014575a(28) =80313433200a(29) =215441