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, 0, 0), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
A148783
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, 0, 0), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =24a(5) =76a(6) =251a(7) =838a(8) =2926a(9) =10169a(10) =36400a(11) =130395a(12) =474831a(13) =1733605a(14) =6403971a(15) =23684098a(16) =88447620a(17) =330426207a(18) =1243990000a(19) =4685124726a(20) =17751802480a(21) =67287467042a(22) =256301925243a(23) =976546214354
External references
- oeis: A148783