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, 0, 0), (1, 0, 1)}.
A149905
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, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =48a(5) =166a(6) =613a(7) =2280a(8) =8976a(9) =35247a(10) =143382a(11) =582249a(12) =2431920a(13) =10125351a(14) =43070020a(15) =182684943a(16) =788474211a(17) =3393379082a(18) =14813919095a(19) =64502077124a(20) =284229195699
External references
- oeis: A149905