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), (0, -1, 1), (1, 1, 0)}.
A149199
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), (0, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =38a(5) =132a(6) =487a(7) =1862a(8) =7245a(9) =28422a(10) =113605a(11) =457643a(12) =1859672a(13) =7605699a(14) =31310991a(15) =129568364a(16) =538485313a(17) =2246892203a(18) =9410626846a(19) =39534850340a(20) =166557012942a(21) =703547733280
External references
- oeis: A149199