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, 0), (-1, 1, -1), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
A149648
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, 0), (-1, 1, -1), (1, -1, 1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =71a(5) =263a(6) =1239a(7) =5113a(8) =24261a(9) =105601a(10) =504725a(11) =2266053a(12) =10895925a(13) =49945815a(14) =241304075a(15) =1122527297a(16) =5443841533a(17) =25601913303a(18) =124539566239a(19) =590624366309
External references
- oeis: A149648