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, -1, 0), (-1, 1, 0), (0, 0, 1), (1, 0, -1)}.
A148074
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, -1, 0), (-1, 1, 0), (0, 0, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =9a(5) =21a(6) =56a(7) =164a(8) =472a(9) =1443a(10) =4442a(11) =13543a(12) =42538a(13) =140125a(14) =461051a(15) =1540007a(16) =5230724a(17) =17608645a(18) =59481321a(19) =206130290a(20) =720298004a(21) =2523815677a(22) =8951596054a(23) =31724219609a(24) =111972880599a(25) =399889272475
External references
- oeis: A148074