A047119 T(2n,n), array T as in A047110.

1, 2, 9, 44, 250, 1418, 8567, 51635, 321039, 1996724, 12628528, 80011583, 511889348, 3282172599, 21172582733, 136879748346, 888481523846, 5778565689270, 37689416642042, 246245960185175, 1612234572834084

Offset: 0

Author

Clark Kimberling; definition revised Dec 08 2006; sequence corrected Dec 18 2006

Keywords

• nonn