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, 0), (0, -1, 0), (0, 1, -1), (1, 1, 1)}.
A149681
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, 0), (0, -1, 0), (0, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =261a(6) =1101a(7) =4661a(8) =20049a(9) =87001a(10) =382589a(11) =1695781a(12) =7569313a(13) =33959517a(14) =153131465a(15) =693502931a(16) =3153074549a(17) =14383223399a(18) =65803927299a(19) =301837483491
External references
- oeis: A149681