Number of labeled trees on n vertices containing two fixed non-adjacent edges.

A301270

Number of labeled trees on n vertices containing two fixed non-adjacent edges.

Terms

    a(0) =4a(1) =20a(2) =144a(3) =1372a(4) =16384a(5) =236196a(6) =4000000a(7) =77948684a(8) =1719926784a(9) =42417997492

External references