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), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.
A149707
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), (0, 1, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =69a(5) =293a(6) =1265a(7) =5491a(8) =24899a(9) =112365a(10) =512129a(11) =2375379a(12) =11021119a(13) =51362551a(14) =241955331a(15) =1140089861a(16) =5389039923a(17) =25643375625a(18) =122089489367a(19) =582545550925
External references
- oeis: A149707