Number of series-reduced dyslexic planted planar trees with n leaves.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =57a(6) =191a(7) =684a(8) =2482a(9) =9275a(10) =35127a(11) =135156a(12) =525545a(13) =2064329a(14) =8173895a(15) =32600082a(16) =130823306a(17) =527888023a(18) =2140454687a(19) =8716907165a(20) =35638352814a(21) =146221542191a(22) =601870210193