A175936 Number of lattice walks from (0,0) to (n,n) using steps S={(k,0),(0,k),(r,r)|0<k<=3,0<r<=2} which never go above the line y=x.

1, 2, 10, 62, 433, 3262, 25784, 210892, 1769793, 15152252, 131826824, 1162114368, 10357863128, 93183955872, 845064072102, 7717150002692, 70903816529979, 654967192303546, 6079243786794502, 56668633625876866, 530291242720187193

Offset

0,2

Links

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

Crossrefs

Cf. A175934, A175935, A175937, A175939.

Sequence in context: A243034 A107026 A107841 * A175937 A175939 A192942

Adjacent sequences: A175933 A175934 A175935 * A175937 A175938 A175939

Keyword

nonn

Author

Eric Werley, Dec 06 2010

Status

approved