G.f.: 1 + 1*x/(1 + 2*x^2/(1 + 3*x^3/(1 + 4*x^4/(1 + 5*x^5/(1 + ...))))).

Terms

a(0) =1a(1) =1a(2) =0a(3) =-2a(4) =0a(5) =4a(6) =6a(7) =-8a(8) =-24a(9) =-2a(10) =48a(11) =76a(12) =-42a(13) =-224a(14) =-144a(15) =406a(16) =744a(17) =-332a(18) =-2154a(19) =-1400a(20) =4320a(21) =7702a(22) =-2016a(23) =-21428a(24) =-17802a(25) =34216a(26) =76152a(27) =-5210a(28) =-195816a(29) =-181916