A129779(n+2)/A006954(n).

Terms

a(0) =-1a(1) =1a(2) =-1a(3) =1a(4) =-5a(5) =63a(6) =-315a(7) =99a(8) =-675675a(9) =135135a(10) =-1640925a(11) =83329155a(12) =-4583103525a(13) =5791834125