Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 0), (-1, 1), (0, -1), (1, -1), (1, 1)}.
A151466
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 0), (-1, 1), (0, -1), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =0a(2) =3a(3) =4a(4) =30a(5) =74a(6) =453a(7) =1538a(8) =8344a(9) =33896a(10) =175156a(11) =786236a(12) =3998516a(13) =19030790a(14) =96707373a(15) =477125050a(16) =2438452956a(17) =12316179442a(18) =63449322110a(19) =325748325720
External references
- oeis: A151466