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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.
4
1, 2, 10, 62, 433, 3262, 25784, 210892, 1769793, 15152252, 131826824, 1162114368, 10357863128, 93183955872, 845064072102, 7717150002692, 70903816529979, 654967192303546, 6079243786794502, 56668633625876866, 530291242720187193
OFFSET
0,2
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric Werley, Dec 06 2010
STATUS
approved