Consider Pascal's triangle A007318; a(n) = LCM of terms at +45 degree slope with the horizontal.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =12a(6) =30a(7) =60a(8) =210a(9) =840a(10) =1260a(11) =2520a(12) =13860a(13) =27720a(14) =180180a(15) =360360a(16) =180180a(17) =720720a(18) =6126120a(19) =12252240a(20) =116396280a(21) =232792560a(22) =116396280a(23) =232792560a(24) =2677114440a(25) =5354228880a(26) =13385572200a(27) =26771144400a(28) =40156716600a(29) =80313433200