Number of bicentered 5-valent trees with n nodes.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =1a(6) =3a(7) =4a(8) =10a(9) =18a(10) =46a(11) =95a(12) =231a(13) =524a(14) =1287a(15) =3095a(16) =7713a(17) =19125a(18) =48258a(19) =122026a(20) =311935a(21) =801061a(22) =2072629a(23) =5387753a(24) =14081981a(25) =36959506a(26) =97419796a(27) =257724555a(28) =684254908a(29) =1822560590