Expansion of g.f. A(x) satisfying A(x) = 1 + x*(5*A(x)^2 - A(-x)^2)/4.

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =30a(5) =83a(6) =402a(7) =1199a(8) =6180a(9) =19232a(10) =102939a(11) =329217a(12) =1807344a(13) =5891442a(14) =32936724a(15) =108884607a(16) =617125788a(17) =2062285676a(18) =11813994060a(19) =39818644316a(20) =230067933810a(21) =780838528379