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, 0, 1), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
A149895
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, 0, 1), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =46a(5) =159a(6) =577a(7) =2147a(8) =8290a(9) =32569a(10) =130736a(11) =531085a(12) =2192274a(13) =9130703a(14) =38470771a(15) =163216207a(16) =698704886a(17) =3007633571a(18) =13038423868a(19) =56779502954a(20) =248683781581
External references
- oeis: A149895