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, 1, 0), (0, 0, -1), (0, 1, 1), (1, -1, 0)}.
A148816
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, 1, 0), (0, 0, -1), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =26a(5) =89a(6) =317a(7) =1129a(8) =4333a(9) =16375a(10) =64689a(11) =255510a(12) =1031520a(13) =4176411a(14) =17235081a(15) =71002938a(16) =297843534a(17) =1246468199a(18) =5289497067a(19) =22427668932a(20) =96117562882a(21) =411666657671
External references
- oeis: A148816