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A175896 Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(1,1)|0<k<=3} which never go above the line y-x. 2

%I

%S 1,2,9,57,396,2948,23016,185838,1539066,13001677,111600446,970550862,

%T 8533427593,75728797781,677427655798,6102015206945,55299451023428,

%U 503847366381836,4612663920303329,42409513650507927,391425863599784588

%N Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(1,1)|0<k<=3} which never go above the line y-x.

%Y Cf. A006318, A175895

%K nonn

%O 0,2

%A _Eric Werley_, Dec 05 2010

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Last modified October 18 12:19 EDT 2021. Contains 348067 sequences. (Running on oeis4.)