Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 1), (-1, 0), (0, 1), (1, -1), (1, 1)}.
A151310
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 1), (-1, 0), (0, 1), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =2a(2) =9a(3) =37a(4) =181a(5) =869a(6) =4430a(7) =22640a(8) =118808a(9) =627275a(10) =3358307a(11) =18087833a(12) =98248087a(13) =536372711a(14) =2945032779a(15) =16237200915a(16) =89896571332a(17) =499383074373
External references
- oeis: A151310