Triangle read by rows: T(n,k) = number of rooted signed trees with n nodes and k positive edges (0 <= k < n).
A304489
Triangle read by rows: T(n,k) = number of rooted signed trees with n nodes and k positive edges (0 <= k < n).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =2a(6) =4a(7) =9a(8) =9a(9) =4a(10) =9a(11) =26a(12) =37a(13) =26a(14) =9a(15) =20a(16) =75a(17) =134a(18) =134a(19) =75a(20) =20a(21) =48a(22) =214a(23) =469a(24) =596a(25) =469a(26) =214a(27) =48a(28) =115a(29) =612
External references
- oeis: A304489