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, -1), (0, 0, -1), (0, 1, 0), (1, -1, 1)}.
A148355
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, -1), (0, 0, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =45a(6) =145a(7) =479a(8) =1673a(9) =5928a(10) =21602a(11) =79826a(12) =300161a(13) =1144599a(14) =4414282a(15) =17226535a(16) =67793778a(17) =269250387a(18) =1077231445a(19) =4339818022a(20) =17600218203a(21) =71764342984a(22) =294309638092
External references
- oeis: A148355