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), (-1, 0, 1), (0, 1, 1), (1, 0, -1)}.
A148447
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), (-1, 0, 1), (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) =25843a(11) =96251a(12) =361442a(13) =1374276a(14) =5293874a(15) =20516616a(16) =80360955a(17) =316699197a(18) =1256415912a(19) =5016548166a(20) =20123158508a(21) =81163144236a(22) =328709365541
External references
- oeis: A148447