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, 0, 0), (-1, 0, 1), (0, -1, 0), (0, 1, -1), (1, 0, 1)}.
A149356
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, 0, 0), (-1, 0, 1), (0, -1, 0), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =43a(5) =152a(6) =609a(7) =2346a(8) =9645a(9) =39039a(10) =165579a(11) =691291a(12) =2982985a(13) =12730758a(14) =55745710a(15) =241767355a(16) =1069979231a(17) =4698008068a(18) =20974022559a(19) =92994069426a(20) =418085807507
External references
- oeis: A149356