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, 0), (1, -1, 0), (1, 1, -1), (1, 1, 1)}.
A149725
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, 0), (1, -1, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =75a(5) =287a(6) =1291a(7) =5511a(8) =25329a(9) =111793a(10) =518297a(11) =2346033a(12) =11019069a(13) =50774817a(14) =239978385a(15) =1117987233a(16) =5317529355a(17) =25013236863a(18) =119552222347a(19) =566185604841
External references
- oeis: A149725