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), (0, 1), (1, -1), (1, 0)}.
A151305
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), (0, 1), (1, -1), (1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =34a(4) =158a(5) =780a(6) =3994a(7) =21108a(8) =114172a(9) =629550a(10) =3526532a(11) =20018456a(12) =114931060a(13) =666344104a(14) =3896536944a(15) =22958243962a(16) =136180482166a(17) =812648207806
External references
- oeis: A151305