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

A190587

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

Terms

    a(0) =1a(1) =2a(2) =4a(3) =10a(4) =24a(5) =56a(6) =130a(7) =304a(8) =714a(9) =1678a(10) =3944a(11) =9276a(12) =21832a(13) =51408a(14) =121088a(15) =285288a(16) =672304a(17) =1584638a(18) =3735596a(19) =8807312a(20) =20766914a(21) =48970942a(22) =115487946a(23) =272371376a(24) =642404770a(25) =1515218012a(26) =3574025956a(27) =8430514614a(28) =19886678810a(29) =46911630678

External references