Number of asymmetric mobiles (circular rooted trees) with n nodes and 6 leaves.

Terms

a(0) =1a(1) =8a(2) =45a(3) =190a(4) =672a(5) =2045a(6) =5580a(7) =13868a(8) =31968a(9) =69069a(10) =141284a(11) =275484a(12) =515296a(13) =928952a(14) =1620895a(15) =2746538a(16) =4533060a(17) =7305216a(18) =11520492a(19) =17811767a(20) =27043799a(21) =40380695a(22) =59373007a(23) =86060337a(24) =123101225a(25) =173924181a(26) =242915666a(27) =335636501