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, 0), (0, 1, 1), (1, 0, -1)}.
A148448
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, 0), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =17a(5) =50a(6) =171a(7) =567a(8) =1986a(9) =7141a(10) =25885a(11) =96335a(12) =361948a(13) =1377016a(14) =5303325a(15) =20571802a(16) =80572919a(17) =317654987a(18) =1260703066a(19) =5033962911a(20) =20202671783a(21) =81492060501a(22) =330138308530
External references
- oeis: A148448