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, 0, 1), (0, 0, -1), (0, 1, 0), (1, -1, 1)}.
A148390
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, 0, 1), (0, 0, -1), (0, 1, 0), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =52a(6) =165a(7) =560a(8) =2005a(9) =7345a(10) =27309a(11) =102070a(12) =389673a(13) =1511857a(14) =5920738a(15) =23410137a(16) =92986782a(17) =372761982a(18) =1506441428a(19) =6122389601a(20) =25027007251a(21) =102632553459a(22) =423107823161
External references
- oeis: A148390