Number of independent sets in rooted plane trees on n nodes.

A007857

Number of independent sets in rooted plane trees on n nodes.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =37a(4) =184a(5) =959a(6) =5172a(7) =28641a(8) =162008a(9) =932503a(10) =5445934a(11) =32197334a(12) =192357788a(13) =1159603592a(14) =7045356104a(15) =43098733353a(16) =265240985112

External references