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, -1), (1, 0)}.
A151498
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, -1), (1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =12a(4) =57a(5) =301a(6) =1707a(7) =10191a(8) =63244a(9) =404503a(10) =2650293a(11) =17709684a(12) =120288313a(13) =828352036a(14) =5771747783a(15) =40625485570a(16) =288482116987
External references
- oeis: A151498