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

0,2

Links

Table of n, a(n) for n=0..20.

Crossrefs

Sequence in context: A365123 A108308 A119855 * A052881 A020071 A248439

Adjacent sequences: A047116 A047117 A047118 * A047120 A047121 A047122

Keyword

nonn

Author

Clark Kimberling, Dec 08 2006

Extensions

Corrected by Clark Kimberling, Dec 18 2006

Status

approved