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), (0, -1, 1), (0, 0, -1), (1, 1, 0)}.
A149357
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), (0, -1, 1), (0, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =43a(5) =163a(6) =631a(7) =2525a(8) =10321a(9) =42811a(10) =180088a(11) =765880a(12) =3286441a(13) =14215607a(14) =61902944a(15) =271139438a(16) =1193813735a(17) =5280214067a(18) =23449724862a(19) =104524431296a(20) =467440584451
External references
- oeis: A149357