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, 0), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
A149893
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, 0), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =45a(5) =155a(6) =553a(7) =2049a(8) =7832a(9) =30577a(10) =121584a(11) =491526a(12) =2013629a(13) =8342993a(14) =34924457a(15) =147498787a(16) =627773947a(17) =2690792993a(18) =11606230826a(19) =50343025311a(20) =219495098281a(21) =961494709417
External references
- oeis: A149893