Triangle read by rows: number of forests of (k+1) ordered trees with 2(n-k) edges having root of even degree and nonroot nodes of outdegree 0 or 2.
A307214
Triangle read by rows: number of forests of (k+1) ordered trees with 2(n-k) edges having root of even degree and nonroot nodes of outdegree 0 or 2.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =2a(5) =1a(6) =10a(7) =7a(8) =3a(9) =1a(10) =35a(11) =26a(12) =12a(13) =4a(14) =1a(15) =126a(16) =99a(17) =49a(18) =18a(19) =5a(20) =1a(21) =462a(22) =382a(23) =201a(24) =80a(25) =25a(26) =6a(27) =1a(28) =1716a(29) =1486
External references
- oeis: A307214