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), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
A149550
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), (0, 1, -1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =57a(5) =189a(6) =849a(7) =3085a(8) =14289a(9) =54329a(10) =256973a(11) =1007905a(12) =4823589a(13) =19409469a(14) =93423353a(15) =384022225a(16) =1854215189a(17) =7752448757a(18) =37533638481a(19) =158987479205a(20) =771992164281
External references
- oeis: A149550