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), (-1, 1, 0), (0, 1, -1), (1, 0, 1)}.
A149337
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), (-1, 1, 0), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =40a(5) =149a(6) =560a(7) =2135a(8) =8353a(9) =33257a(10) =133224a(11) =538665a(12) =2199354a(13) =9031105a(14) =37260077a(15) =154539062a(16) =643804334a(17) =2691018641a(18) =11284671195a(19) =47469498047a(20) =200204187669a(21) =846321739136
External references
- oeis: A149337