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, 1, -1), (0, 1, 1), (1, -1, 1)}.
A148913
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, 1, -1), (0, 1, 1), (1, -1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =32a(5) =110a(6) =439a(7) =1666a(8) =6994a(9) =27973a(10) =120070a(11) =497085a(12) =2173482a(13) =9217092a(14) =40801588a(15) =176127282a(16) =787337480a(17) =3444938616a(18) =15517587403a(19) =68626521533a(20) =311044993157
External references
- oeis: A148913