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), (0, 0, 1), (0, 1, -1), (1, 0, 0)}.
A149929
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), (0, 0, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =48a(5) =168a(6) =608a(7) =2268a(8) =8662a(9) =33778a(10) =134184a(11) =539871a(12) =2197090a(13) =9030000a(14) =37459341a(15) =156606474a(16) =659061461a(17) =2790192515a(18) =11877890745a(19) =50819264437a(20) =218390536236a(21) =942266919891
External references
- oeis: A149929