Expansion of g.f. A(x) satisfying A(x) = 1 + x*(3*A(x)^2 + A(-x)^2)/4.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =4a(5) =15a(6) =22a(7) =91a(8) =140a(9) =612a(10) =969a(11) =4389a(12) =7084a(13) =32890a(14) =53820a(15) =254475a(16) =420732a(17) =2017356a(18) =3362260a(19) =16301164a(20) =27343888a(21) =133767543a(22) =225568798a(23) =1111731933a(24) =1882933364a(25) =9338434700a(26) =15875338990a(27) =79155435870a(28) =134993766600a(29) =676196049060