a(n) = denominator of Sum_{k=1..n} k^mu(n+1-k), where mu(m) = A008683(m).

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =12a(5) =20a(6) =10a(7) =84a(8) =840a(9) =72a(10) =630a(11) =1320a(12) =2772a(13) =1560a(14) =90090a(15) =42a(16) =240240a(17) =1904a(18) =46410a(19) =95760a(20) =639540a(21) =5040a(22) =9699690a(23) =637560a(24) =14316120a(25) =92400a(26) =176125950a(27) =308880a(28) =20078358300a(29) =475020