Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (0, -1), (0, 1), (1, -1), (1, 0)}.
A151442
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (0, -1), (0, 1), (1, -1), (1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =13a(5) =37a(6) =111a(7) =348a(8) =1115a(9) =3690a(10) =12437a(11) =42646a(12) =148530a(13) =523835a(14) =1868356a(15) =6729649a(16) =24454173a(17) =89552497a(18) =330263689a(19) =1225741014a(20) =4575462854a(21) =17169395749a(22) =64738926261a(23) =245187658138a(24) =932406910922
External references
- oeis: A151442