Triangle read by rows: T(n,k) (n >= 1, 1 <= k <= n) = number of normalized 2n-plets, with single or double steps, associated to trees with k edges.
A294440
Triangle read by rows: T(n,k) (n >= 1, 1 <= k <= n) = number of normalized 2n-plets, with single or double steps, associated to trees with k edges.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =4a(4) =6a(5) =1a(6) =8a(7) =25a(8) =12a(9) =1a(10) =16a(11) =90a(12) =85a(13) =20a(14) =1a(15) =32a(16) =301a(17) =476a(18) =215a(19) =30a(20) =1a(21) =64a(22) =966a(23) =2345a(24) =1722a(25) =455a(26) =42a(27) =1a(28) =128a(29) =3025
External references
- oeis: A294440