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, 1), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
A150187
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, 1), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =74a(5) =283a(6) =1118a(7) =4474a(8) =18418a(9) =76926a(10) =324603a(11) =1386443a(12) =5975585a(13) =25934455a(14) =113306676a(15) =498104688a(16) =2200289474a(17) =9762376912a(18) =43502560144a(19) =194545972756a(20) =872853253320
External references
- oeis: A150187