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, -1), (-1, -1, 1), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
A148907
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, -1), (-1, -1, 1), (-1, 1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =32a(5) =105a(6) =435a(7) =1585a(8) =6847a(9) =26144a(10) =117306a(11) =463831a(12) =2121051a(13) =8617173a(14) =39898701a(15) =165430592a(16) =773730816a(17) =3259812284a(18) =15362861588a(19) =65556570624a(20) =310851161790
External references
- oeis: A148907