Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, 1), (1, -1), (1, 0), (1, 1)}.
A151320
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, 1), (1, -1), (1, 0), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =58a(4) =270a(5) =1280a(6) =6150a(7) =29805a(8) =145360a(9) =712206a(10) =3501803a(11) =17264747a(12) =85302729a(13) =422197260a(14) =2092558843a(15) =10383452493a(16) =51573082768a(17) =256362474771
External references
- oeis: A151320