%I #9 May 09 2022 00:36:23
%S 1,2,10,62,433,3262,25784,210892,1769793,15152252,131826824,
%T 1162114368,10357863128,93183955872,845064072102,7717150002692,
%U 70903816529979,654967192303546,6079243786794502,56668633625876866,530291242720187193
%N 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.
%Y Cf. A175934, A175935, A175937, A175939.
%K nonn
%O 0,2
%A _Eric Werley_, Dec 06 2010