Triangular array: For n >= 2 and 0 < k <= n - 2, T(n, k) equals the number of (unrooted) duplication trees on n gene segments that are canonical and whose leftmost visible duplication event is (k, r), for 1 <= r <= (n - k)/2.
A264870
Triangular array: For n >= 2 and 0 < k <= n - 2, T(n, k) equals the number of (unrooted) duplication trees on n gene segments that are canonical and whose leftmost visible duplication event is (k, r), for 1 <= r <= (n - k)/2.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =3a(9) =3a(10) =5a(11) =8a(12) =11a(13) =11a(14) =11a(15) =13a(16) =24a(17) =35a(18) =46a(19) =46a(20) =46a(21) =37a(22) =72a(23) =118a(24) =164a(25) =210a(26) =210a(27) =210a(28) =109a(29) =227
External references
- oeis: A264870