The number of nonnegative walks of n steps with step sizes 1 and 2, starting at 0 and ending at 2.

A296619

The number of nonnegative walks of n steps with step sizes 1 and 2, starting at 0 and ending at 2.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =6a(4) =13a(5) =52a(6) =152a(7) =550a(8) =1813a(9) =6453a(10) =22427a(11) =80330a(12) =286895a(13) =1038931a(14) =3772801a(15) =13807294a(16) =50726893a(17) =187332517a(18) =694364517a(19) =2583714636a(20) =9644852364a(21) =36115537269a(22) =135607526865a(23) =510496492338

External references