Number of chiral planted trees with n nodes.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =6a(6) =20a(7) =60a(8) =176a(9) =510a(10) =1484a(11) =4314a(12) =12624a(13) =37126a(14) =109864a(15) =326958a(16) =978528a(17) =2943384a(18) =8895792a(19) =27001378a(20) =82281216a(21) =251636434a(22) =772101086a(23) =2376186784a(24) =7333094178a(25) =22688117658a(26) =70360646672a(27) =218678194238a(28) =681016789056