Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (0, 1, 1), (1, -1, -1), (1, 1, -1)}.
A148811
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (0, 1, 1), (1, -1, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =86a(6) =309a(7) =1108a(8) =4177a(9) =16043a(10) =62131a(11) =245624a(12) =988058a(13) =3974672a(14) =16249872a(15) =67146327a(16) =277391652a(17) =1159193515a(18) =4883667639a(19) =20554100144a(20) =87291612458a(21) =373042330747
External references
- oeis: A148811