Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (1, -1), (1, 1)}.
A151343
Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (1, -1), (1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =29a(4) =230a(5) =2034a(6) =19636a(7) =200219a(8) =2128690a(9) =23402066a(10) =264236768a(11) =3049648298a(12) =35848893160a(13) =428019644312
External references
- oeis: A151343