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, 0, -1), (0, 1, 1), (1, 0, 0)}.
A150209
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, 0, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =81a(5) =321a(6) =1305a(7) =5448a(8) =23177a(9) =99896a(10) =435039a(11) =1911767a(12) =8466540a(13) =37735029a(14) =169098694a(15) =761375279a(16) =3442420307a(17) =15621467912a(18) =71120379994a(19) =324737224019
External references
- oeis: A150209