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, 0, 1), (-1, 1, 1), (0, 1, 1), (1, 0, -1)}.
A148455
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, 0, 1), (-1, 1, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =18a(5) =54a(6) =189a(7) =633a(8) =2304a(9) =8304a(10) =31165a(11) =117040a(12) =450812a(13) =1738597a(14) =6832754a(15) =26873783a(16) =107237479a(17) =428294527a(18) =1729570438a(19) =6992686966a(20) =28512482373a(21) =116421902463a(22) =478533610040
External references
- oeis: A148455