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, 1, -1)}.
A148280
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, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =16a(5) =46a(6) =193a(7) =622a(8) =2701a(9) =9325a(10) =42182a(11) =154184a(12) =711849a(13) =2705836a(14) =12670859a(15) =49549930a(16) =234642749a(17) =938567225a(18) =4481414935a(19) =18256143420a(20) =87727604158a(21) =362745516847
External references
- oeis: A148280