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, 0), (-1, 0, 0), (-1, 1, -1), (0, 0, 1), (1, 0, 0)}.
A149908
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, 0), (-1, 0, 0), (-1, 1, -1), (0, 0, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =45a(5) =148a(6) =502a(7) =1747a(8) =6317a(9) =23052a(10) =86168a(11) =326073a(12) =1247768a(13) =4839365a(14) =18891695a(15) =74501818a(16) =295679894a(17) =1181086264a(18) =4748015184a(19) =19173354653a(20) =77844912265a(21) =317299791462
External references
- oeis: A149908