E.g.f.: exp( (x * exp(-x) + sinh(x)) / 2 ).

Terms

a(0) =1a(1) =1a(2) =0a(3) =0a(4) =4a(5) =-1a(6) =-9a(7) =103a(8) =-132a(9) =-535a(10) =7731a(11) =-25117a(12) =-18072a(13) =1078215a(14) =-6917039a(15) =16312667a(16) =186611792a(17) =-2454241183a(18) =14370311311a(19) =1436259867a(20) =-934228834216