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), (1, 1)}.
A151393
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), (1, 1)}.
Terms
- a(0) =1a(1) =3a(2) =23a(3) =229a(4) =2564a(5) =30874a(6) =390124a(7) =5100052a(8) =68384716a(9) =935121688a(10) =12988742454a(11) =182726814050
External references
- oeis: A151393