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, 0, 0), (0, -1, 1), (0, 0, 1), (0, 1, -1), (1, 1, -1)}.
A148887
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, 0, 0), (0, -1, 1), (0, 0, 1), (0, 1, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =30a(5) =102a(6) =399a(7) =1549a(8) =6331a(9) =26197a(10) =111058a(11) =476943a(12) =2078542a(13) =9150328a(14) =40704579a(15) =182483318a(16) =824427887a(17) =3747916247a(18) =17138403170a(19) =78769757858a(20) =363711035059
External references
- oeis: A148887