Triangular array: For n >= 2 and 0 <= k <= n - 2, T(n, k) equals the number of rooted duplication trees on n gene segments whose leftmost visible duplication event is (k, r), for 1 <= r <= (n - k)/2.
A264869
Triangular array: For n >= 2 and 0 <= k <= n - 2, T(n, k) equals the number of rooted duplication trees on n gene segments whose leftmost visible duplication event is (k, r), for 1 <= r <= (n - k)/2.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =2a(6) =4a(7) =6a(8) =6a(9) =6a(10) =10a(11) =16a(12) =22a(13) =22a(14) =22a(15) =26a(16) =48a(17) =70a(18) =92a(19) =92a(20) =92a(21) =74a(22) =144a(23) =236a(24) =328a(25) =420a(26) =420a(27) =420a(28) =218a(29) =454
External references
- oeis: A264869