Exponential reciprocal of A055924.

Terms

a(0) =-1a(1) =1a(2) =0a(3) =-2a(4) =0a(5) =1a(6) =6a(7) =0a(8) =-6a(9) =1a(10) =-24a(11) =0a(12) =35a(13) =-10a(14) =-2a(15) =120a(16) =0a(17) =-225a(18) =85a(19) =30a(20) =-9a(21) =-720a(22) =0a(23) =1624a(24) =-735a(25) =-350a(26) =189a(27) =-9a(28) =5040a(29) =0