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, 0), (1, 0, 1), (1, 1, -1)}.
A148825
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, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =85a(6) =309a(7) =1053a(8) =3993a(9) =14580a(10) =56902a(11) =213193a(12) =849648a(13) =3287898a(14) =13305305a(15) =52381689a(16) =214652540a(17) =859220234a(18) =3555649314a(19) =14413785104a(20) =60145523692a(21) =246338374599
External references
- oeis: A148825