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), (-1, 1, 1), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
A148489
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), (-1, 1, 1), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =73a(6) =272a(7) =1055a(8) =4226a(9) =17296a(10) =72002a(11) =304223a(12) =1302487a(13) =5631257a(14) =24557910a(15) =107912037a(16) =477269006a(17) =2122877159a(18) =9489677428a(19) =42608326043a(20) =192070741414a(21) =868890650080
External references
- oeis: A148489