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, 0), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
A148973
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, 0), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =107a(6) =401a(7) =1510a(8) =5995a(9) =23717a(10) =96670a(11) =396096a(12) =1654158a(13) =6950924a(14) =29542096a(15) =126332499a(16) =544511785a(17) =2360468369a(18) =10292596351a(19) =45099988407a(20) =198528103186a(21) =877512440783
External references
- oeis: A148973