A127833 T(3n,2n), where T is the array in A127832.

0, 4, 54, 954, 19116, 412430, 9343712, 219173604, 5276758498, 129640779394

Offset

0,2

Links

Table of n, a(n) for n=0..9.

Example

The 4 UR paths counted by a(1)=T(3,2) are RRRUU, RRURU, UURRR, URURR. These
paths touch the line y=2x/3 only at the lattice points (0,0) and (3,2).

Crossrefs

Cf. A127832.

Sequence in context: A221611 A303048 A304556 * A346291 A258846 A093983

Adjacent sequences: A127830 A127831 A127832 * A127834 A127835 A127836

Keyword

nonn

Author

Clark Kimberling, Feb 01 2007

Status

approved