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, 1), (0, 0, -1), (1, 0, 1), (1, 1, -1)}.
A149378
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, 1), (0, 0, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =48a(5) =172a(6) =704a(7) =2832a(8) =12048a(9) =51167a(10) =222291a(11) =972073a(12) =4314357a(13) =19287153a(14) =86967804a(15) =394239816a(16) =1798586922a(17) =8247848422a(18) =38011507458a(19) =175879906285a(20) =816790596799
External references
- oeis: A149378