Number of forests of labeled rooted trees of height at most 1, with n labels, four of which are used for root nodes and any root may contain >= 1 labels.
A273654
Number of forests of labeled rooted trees of height at most 1, with n labels, four of which are used for root nodes and any root may contain >= 1 labels.
Terms
- a(0) =15a(1) =185a(2) =1485a(3) =9905a(4) =59850a(5) =341082a(6) =1872990a(7) =10032990a(8) =52814025a(9) =274436305a(10) =1411449039a(11) =7195628895a(12) =36390053700a(13) =182622509860a(14) =909578754540
External references
- oeis: A273654