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, 0, 1), (0, 0, -1), (0, 1, 1), (1, -1, 1)}.
A148839
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, 0, 1), (0, 0, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =90a(6) =319a(7) =1133a(8) =4205a(9) =15759a(10) =60427a(11) =233074a(12) =913214a(13) =3602736a(14) =14365891a(15) =57610031a(16) =232900379a(17) =946343007a(18) =3869179663a(19) =15888284571a(20) =65568408186a(21) =271629504874
External references
- oeis: A148839