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, 1, 0), (1, 0, -1), (1, 1, 1)}.
A149262
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, 1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =40a(5) =124a(6) =474a(7) =1599a(8) =6214a(9) =21790a(10) =85368a(11) =306948a(12) =1209606a(13) =4426724a(14) =17512502a(15) =64916857a(16) =257475442a(17) =963710264a(18) =3829460462a(19) =14442356656a(20) =57468053150a(21) =218058093974a(22) =868578080482
External references
- oeis: A149262