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, 1), (-1, 1, 0), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
A148983
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, 1), (-1, 1, 0), (0, -1, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =112a(6) =430a(7) =1666a(8) =6695a(9) =27318a(10) =113765a(11) =479021a(12) =2044040a(13) =8799249a(14) =38215081a(15) =167159601a(16) =735913495a(17) =3258056505a(18) =14497203455a(19) =64796051816a(20) =290782505717
External references
- oeis: A148983