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, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148864
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, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =96a(6) =360a(7) =1384a(8) =5513a(9) =22356a(10) =92884a(11) =391014a(12) =1669886a(13) =7215742a(14) =31490654a(15) =138607154a(16) =615048548a(17) =2747302204a(18) =12346906738a(19) =55802001785a(20) =253432831954
External references
- oeis: A148864