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), (-1, 0, 1), (0, 1, -1), (1, -1, 0), (1, 1, 1)}.
A149775
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), (-1, 0, 1), (0, 1, -1), (1, -1, 0), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =79a(5) =335a(6) =1475a(7) =6623a(8) =30169a(9) =139011a(10) =647491a(11) =3036287a(12) =14320467a(13) =67922265a(14) =323625887a(15) =1547491223a(16) =7424602537a(17) =35729142713a(18) =172370876791a(19) =833423033447
External references
- oeis: A149775