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, -1, 1), (-1, 1, -1), (1, 0, 0), (1, 0, 1)}.
A149875
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, -1, 1), (-1, 1, -1), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =13a(4) =45a(5) =150a(6) =548a(7) =1895a(8) =7595a(9) =28565a(10) =115446a(11) =438694a(12) =1862878a(13) =7407410a(14) =31401854a(15) =125165643a(16) =548208863a(17) =2251065516a(18) =9811745632a(19) =40261665482a(20) =179765822208a(21) =753826837023
External references
- oeis: A149875