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, 0, 1), (-1, 1, 0), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
A148488
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, 0, 1), (-1, 1, 0), (0, -1, 1), (0, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =73a(6) =272a(7) =1054a(8) =4214a(9) =17226a(10) =71623a(11) =302252a(12) =1292432a(13) =5581926a(14) =24319777a(15) =106774166a(16) =471860548a(17) =2097325988a(18) =9369510453a(19) =42044499840a(20) =189429350786a(21) =856534717875
External references
- oeis: A148488