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), (1, -1, 1), (1, 1, 0)}.
A149205
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), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =10a(4) =40a(5) =129a(6) =537a(7) =1933a(8) =8328a(9) =31833a(10) =140729a(11) =559013a(12) =2518826a(13) =10280324a(14) =46991877a(15) =195714236a(16) =904660544a(17) =3827438751a(18) =17850086730a(19) =76473277330a(20) =359252690128
External references
- oeis: A149205