Number of asymmetric rooted Greg trees.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =43a(6) =138a(7) =455a(8) =1540a(9) =5305a(10) =18546a(11) =65616a(12) =234546a(13) =845683a(14) =3072350a(15) =11235393a(16) =41326470a(17) =152793376a(18) =567518950a(19) =2116666670a(20) =7924062430a(21) =29765741831a(22) =112157686170a(23) =423809991041