Number of two-sided n-step prudent walks ending on the top side of their box, avoiding two or more consecutive west steps and south steps.

A190586

Number of two-sided n-step prudent walks ending on the top side of their box, avoiding two or more consecutive west steps and south steps.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =15a(4) =35a(5) =83a(6) =195a(7) =460a(8) =1085a(9) =2560a(10) =6039a(11) =14247a(12) =33613a(13) =79306a(14) =187114a(15) =441477a(16) =1041626a(17) =2457630a(18) =5798569a(19) =13681202a(20) =32279488a(21) =76160166a(22) =179691649a(23) =423961718a(24) =1000285928a(25) =2360046161a(26) =5568211498a(27) =13137414580a(28) =30995819288a(29) =73129978187

External references