G.f. satisfies: A(x) = 1 + x*A(x)^4/A(-x)^2.

Terms

a(0) =1a(1) =1a(2) =6a(3) =29a(4) =242a(5) =1554a(6) =14476a(7) =104061a(8) =1024122a(9) =7818662a(10) =79523444a(11) =630256402a(12) =6552401972a(13) =53271202948a(14) =562560238232