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), (1, -1, 0), (1, 0, -1), (1, 1, 1)}.
A149680
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), (1, -1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =257a(6) =1123a(7) =4609a(8) =20149a(9) =86133a(10) =384359a(11) =1678189a(12) =7555497a(13) =33547783a(14) =152248901a(15) =683700859a(16) =3122031341a(17) =14143050233a(18) =64896996275a(19) =296006914703
External references
- oeis: A149680