Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (-1, 1), (1, -1), (1, 0)}.
A151505
Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (-1, 1), (1, -1), (1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =12a(3) =101a(4) =1032a(5) =11920a(6) =149961a(7) =2009612a(8) =28274682a(9) =413539023a(10) =6242609402a(11) =96747540753
External references
- oeis: A151505