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, 1), (-1, 1, 0), (0, -1, 1), (1, 0, 1), (1, 1, -1)}.
A149475
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, 1), (-1, 1, 0), (0, -1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =56a(5) =226a(6) =992a(7) =4379a(8) =19858a(9) =90896a(10) =421880a(11) =1972067a(12) =9292868a(13) =44031800a(14) =209706374a(15) =1002851646a(16) =4813287969a(17) =23172425977a(18) =111861209159a(19) =541258139896
External references
- oeis: A149475