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), (0, 0, -1), (0, 1, 0), (1, 0, 0)}.
A149844
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), (0, 0, -1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =38a(5) =114a(6) =386a(7) =1382a(8) =4822a(9) =17508a(10) =66394a(11) =250268a(12) =953578a(13) =3737668a(14) =14728014a(15) =58160096a(16) =233302828a(17) =944642728a(18) =3831196078a(19) =15657400600a(20) =64551140608a(21) =266981261146
External references
- oeis: A149844