a(n) = LCM { Catalan(0), ..., Catalan(n) }.

Terms

a(0) =1a(1) =1a(2) =2a(3) =10a(4) =70a(5) =210a(6) =4620a(7) =60060a(8) =60060a(9) =1021020a(10) =19399380a(11) =19399380a(12) =446185740a(13) =2230928700a(14) =13385572200a(15) =388181593800