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, 0, 0), (0, -1, 0), (0, 0, -1), (1, 1, 1)}.
A149662
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, 0, 0), (0, -1, 0), (0, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =61a(5) =241a(6) =995a(7) =4061a(8) =16877a(9) =71739a(10) =308905a(11) =1330317a(12) =5777979a(13) =25333477a(14) =111749727a(15) =493731117a(16) =2191906317a(17) =9780182467a(18) =43796700389a(19) =196437535731a(20) =883766969625
External references
- oeis: A149662