G.f. A(x) satisfies A(x) = Product_{k>=1} 1/(1 + x^k*A(x)).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-3a(4) =8a(5) =-22a(6) =62a(7) =-182a(8) =550a(9) =-1694a(10) =5294a(11) =-16758a(12) =53635a(13) =-173260a(14) =564129a(15) =-1849448a(16) =6099972a(17) =-20227036a(18) =67390803a(19) =-225485432a(20) =757361764a(21) =-2552692848a(22) =8631144354a(23) =-29268108530a(24) =99511629658a(25) =-339167845294