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, -1), (-1, -1, 1), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.
A149552
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, -1), (-1, -1, 1), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =13a(4) =57a(5) =191a(6) =855a(7) =3145a(8) =14487a(9) =56053a(10) =262737a(11) =1051331a(12) =4980261a(13) =20405301a(14) =97446293a(15) =406337835a(16) =1952898023a(17) =8257524711a(18) =39874911661a(19) =170547958021a(20) =826500403861
External references
- oeis: A149552