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), (-1, 1), (0, -1), (1, -1), (1, 0)}.
A151506
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), (-1, 1), (0, -1), (1, -1), (1, 0)}.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =5a(5) =6a(6) =33a(7) =66a(8) =262a(9) =688a(10) =2614a(11) =7630a(12) =28372a(13) =91490a(14) =333166a(15) =1139686a(16) =4172274a(17) =14771196a(18) =54529720a(19) =198319758a(20) =738538816a(21) =2738271072a(22) =10302251312a(23) =38749276416a(24) =147201935416a(25) =560210700982
External references
- oeis: A151506