a(n) = LCM{1, C(n-1,1), C(n-2,2), ..., C(n-[ n/2 ],[ n/2 ])}.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =12a(5) =30a(6) =60a(7) =210a(8) =840a(9) =1260a(10) =2520a(11) =13860a(12) =27720a(13) =180180a(14) =360360a(15) =180180a(16) =720720a(17) =6126120a(18) =12252240a(19) =116396280a(20) =232792560a(21) =116396280a(22) =232792560a(23) =2677114440a(24) =5354228880a(25) =13385572200a(26) =26771144400a(27) =40156716600a(28) =80313433200