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, 0, 0), (0, -1, 1), (1, -1, 0), (1, 1, -1), (1, 1, 1)}.
A149781
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, 0, 0), (0, -1, 1), (1, -1, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =81a(5) =349a(6) =1553a(7) =6971a(8) =32045a(9) =148507a(10) =693999a(11) =3265819a(12) =15462795a(13) =73518369a(14) =351045505a(15) =1682219487a(16) =8085178163a(17) =38961572889a(18) =188203835333a(19) =910988265525
External references
- oeis: A149781