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, 0, 0), (-1, 1, -1), (0, 1, 1), (1, 0, 0)}.
A149982
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, 0, 0), (-1, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =55a(5) =200a(6) =737a(7) =2772a(8) =10763a(9) =41806a(10) =166215a(11) =662867a(12) =2674845a(13) =10868017a(14) =44389916a(15) =182614079a(16) =753678185a(17) =3127891664a(18) =13020561792a(19) =54411159168a(20) =228060902666a(21) =958555573998
External references
- oeis: A149982