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, 1), (0, 1, 0), (1, 0, 1), (1, 1, -1)}.
A150257
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, 1), (0, 1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =22a(4) =86a(5) =353a(6) =1495a(7) =6502a(8) =28743a(9) =128758a(10) =583451a(11) =2668374a(12) =12292808a(13) =56987684a(14) =265676183a(15) =1244433194a(16) =5852518906a(17) =27624837972a(18) =130821101228a(19) =621293592096
External references
- oeis: A150257