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), (1,1,1)}.
A149430
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), (1,1,1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =44a(5) =160a(6) =576a(7) =2137a(8) =8000a(9) =30112a(10) =114540a(11) =436996a(12) =1676116a(13) =6453108a(14) =24911776a(15) =96460701a(16) =374292952a(17) =1455282884a(18) =5668438104a(19) =22111680424a(20) =86375698280a(21) =337822484240
External references
- oeis: A149430