Number of n-step one-sided prudent walks, avoiding exactly two consecutive west steps (can have three or more west steps).

A190525

Number of n-step one-sided prudent walks, avoiding exactly two consecutive west steps (can have three or more west steps).

Terms

    a(0) =1a(1) =3a(2) =6a(3) =15a(4) =34a(5) =80a(6) =185a(7) =431a(8) =1001a(9) =2328a(10) =5411a(11) =12580a(12) =29244a(13) =67985a(14) =158045a(15) =367411a(16) =854126a(17) =1985603a(18) =4615966a(19) =10730820a(20) =24946129a(21) =57992715a(22) =134816705a(23) =313410816a(24) =728591751a(25) =1693770328a(26) =3937538296a(27) =9153665985a(28) =21279691689a(29) =49469281395

External references