Number of lattice paths of 2*n+2 steps in the first quadrant from (0,0) to (n,n).
A253487
Number of lattice paths of 2*n+2 steps in the first quadrant from (0,0) to (n,n).
Terms
- a(0) =2a(1) =16a(2) =90a(3) =448a(4) =2100a(5) =9504a(6) =42042a(7) =183040a(8) =787644a(9) =3359200a(10) =14226212a(11) =59907456a(12) =251100200a(13) =1048380480a(14) =4362680250a(15) =18103127040a(16) =74934688620a(17) =309509877600
External references
- oeis: A253487