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), (0, 1, -1), (1, 0, 0), (1, 1, -1), (1, 1, 0)}.
A149952
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), (0, 1, -1), (1, 0, 0), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =50a(5) =180a(6) =672a(7) =2604a(8) =10323a(9) =41831a(10) =172429a(11) =720543a(12) =3049052a(13) =13030183a(14) =56185637a(15) =244129491a(16) =1067890597a(17) =4699223135a(18) =20788315074a(19) =92400789578a(20) =412460510507
External references
- oeis: A149952