Number of rooted compound windmills (mobiles) of n nodes with no symmetries.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =10a(6) =23a(7) =59a(8) =148a(9) =385a(10) =1006a(11) =2678a(12) =7170a(13) =19421a(14) =52933a(15) =145364a(16) =401421a(17) =1114713a(18) =3109710a(19) =8713076a(20) =24506121a(21) =69168705a(22) =195849114a(23) =556165311a(24) =1583601840a(25) =4520226558a(26) =12931917204a(27) =37075154703