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)}.
A151387
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)}.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =74a(4) =636a(5) =5996a(6) =60500a(7) =640536a(8) =7032004a(9) =79442404a(10) =918460996a(11) =10822792116a(12) =129586488144
External references
- oeis: A151387