Number of rooted labeled trees of height 2 such that every leaf is at a distance 2 from the root.

A220232

Number of rooted labeled trees of height 2 such that every leaf is at a distance 2 from the root.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =6a(4) =12a(5) =80a(6) =390a(7) =2352a(8) =15176a(9) =106416a(10) =801450a(11) =6446000a(12) =55056012a(13) =497109912a(14) =4726554014a(15) =47164460280a(16) =492470203920

External references