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), (0, 0, 1), (0, 1, 1), (1, 1, -1)}.
A150081
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), (0, 0, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =68a(5) =244a(6) =940a(7) =3664a(8) =14912a(9) =60352a(10) =250096a(11) =1048384a(12) =4443072a(13) =18900064a(14) =81303808a(15) =352064448a(16) =1531429504a(17) =6693330816a(18) =29435214720a(19) =129924836736a(20) =575299901184
External references
- oeis: A150081