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, 1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
A149477
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, 1), (0, 1, -1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =57a(5) =214a(6) =979a(7) =4092a(8) =19118a(9) =83810a(10) =397074a(11) =1792264a(12) =8569134a(13) =39449523a(14) =189833114a(15) =886149501a(16) =4284798960a(17) =20208047001a(18) =98076614702a(19) =466207454479
External references
- oeis: A149477