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), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
A149317
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), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =52a(5) =170a(6) =820a(7) =2959a(8) =14514a(9) =55611a(10) =274519a(11) =1091963a(12) =5413275a(13) =22125974a(14) =109968669a(15) =458527130a(16) =2282677742a(17) =9666067566a(18) =48176053055a(19) =206527439304
External references
- oeis: A149317