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), (-1, 1, 1), (1, -1, 1), (1, 1, 0)}.
A149167
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), (-1, 1, 1), (1, -1, 1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =9a(4) =42a(5) =122a(6) =590a(7) =1909a(8) =9352a(9) =32288a(10) =159348a(11) =575336a(12) =2852154a(13) =10632642a(14) =52848864a(15) =201805251a(16) =1004738946a(17) =3909911352a(18) =19488971892a(19) =77013020910a(20) =384181779814
External references
- oeis: A149167