a(n) = denominator(b(n)), where b(0) = b(1) = 1 and b(n) = n*b(n-1)/b(n-2) for n >= 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =5a(9) =5a(10) =7a(11) =14a(12) =6a(13) =15a(14) =275a(15) =11a(16) =91a(17) =637a(18) =14a(19) =200a(20) =935a(21) =187a(22) =247a(23) =12103a(24) =245a(25) =22a(26) =47311a(27) =4301a(28) =247a(29) =112385