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, 1), (-1, 1, 1), (0, 1, 0), (1, -1, 0), (1, 0, -1)}.
A148366
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, 1), (-1, 1, 1), (0, 1, 0), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =49a(6) =178a(7) =663a(8) =2599a(9) =10464a(10) =43281a(11) =182870a(12) =786326a(13) =3432964a(14) =15178764a(15) =67856987a(16) =306252851a(17) =1393718374a(18) =6389136297a(19) =29478905335a(20) =136795502578a(21) =638051453583
External references
- oeis: A148366