Number of nonnegative lattice paths from (0,0) to (n,0) using steps in {(1,-4), (1,-1), (1,0), (1,1)}.

A348202

Number of nonnegative lattice paths from (0,0) to (n,0) using steps in {(1,-4), (1,-1), (1,0), (1,1)}.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =22a(6) =57a(7) =155a(8) =435a(9) =1249a(10) =3645a(11) =10770a(12) =32143a(13) =96747a(14) =293359a(15) =895373a(16) =2748803a(17) =8483035a(18) =26302248a(19) =81896176a(20) =255967640a(21) =802790415a(22) =2525691721a(23) =7968972542a(24) =25209580699a(25) =79942927651a(26) =254077293876a(27) =809192984902

External references