Number of mobiles (cycle rooted trees) with n nodes and 2-colored internal (non-leaf) nodes.

A108531

Number of mobiles (cycle rooted trees) with n nodes and 2-colored internal (non-leaf) nodes.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =18a(4) =60a(5) =206a(6) =770a(7) =2950a(8) =11748a(9) =47746a(10) =197808a(11) =830878a(12) =3532790a(13) =15168294a(14) =65683552a(15) =286504378a(16) =1257693038a(17) =5551978426a(18) =24630911086a(19) =109759215338a(20) =491060888588

External references