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, 1), (1, 0, -1), (1, 1, 1)}.
A149606
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, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =61a(5) =237a(6) =975a(7) =4081a(8) =17261a(9) =74547a(10) =322841a(11) =1420107a(12) =6261387a(13) =27888709a(14) =124625769a(15) =560265961a(16) =2528574721a(17) =11451972219a(18) =52069274841a(19) =237281726121
External references
- oeis: A149606