Duchon's numbers: the number of paths of length 5*n from the origin to the line y=2*x/3 with unit East and North steps that stay below the line or touch it.
1, 2, 23, 377, 7229, 151491, 3361598, 77635093, 1846620581, 44930294909
1 seqfan posts
Thu Oct 1 04:10:39 CEST 2009 [seqfan] Re: lattice paths