Series reversion of the g.f. of A228862.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-2a(4) =3a(5) =-4a(6) =6a(7) =-10a(8) =18a(9) =-35a(10) =71a(11) =-147a(12) =303a(13) =-616a(14) =1244a(15) =-2508a(16) =5067a(17) =-10296a(18) =21097a(19) =-43624a(20) =90929a(21) =-190629a(22) =401053a(23) =-845374a(24) =1784015a(25) =-3768964a(26) =7973941a(27) =-16902610a(28) =35909941a(29) =-76473042