Number of two-sided n-step prudent walks avoiding two or more consecutive west steps and two or more consecutive south steps.

A190589

Number of two-sided n-step prudent walks avoiding two or more consecutive west steps and two or more consecutive south steps.

Terms

    a(0) =1a(1) =4a(2) =8a(3) =20a(4) =46a(5) =110a(6) =260a(7) =616a(8) =1456a(9) =3442a(10) =8134a(11) =19218a(12) =45394a(13) =107204a(14) =253140a(15) =597666a(16) =1410948a(17) =3330622a(18) =7861542a(19) =18555092a(20) =43792062a(21) =103349390a(22) =243895352a(23) =575552060a(24) =1358167086a(25) =3204874310a(26) =7562397040a(27) =17844314546a(28) =42104959766a(29) =99348325696

External references