Number of lattice paths from (0,0) to (n,n) that do not go below the x-axis or above the diagonal x=y and consist of steps U=(1,1), D=(1,-1) and S=(0,1).
A224769
Number of lattice paths from (0,0) to (n,n) that do not go below the x-axis or above the diagonal x=y and consist of steps U=(1,1), D=(1,-1) and S=(0,1).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =7a(4) =33a(5) =184a(6) =1142a(7) =7629a(8) =53750a(9) =394157a(10) =2981546a(11) =23117242a(12) =182867360a(13) =1470714606a(14) =11993628444a(15) =98967634147a(16) =824958769631
External references
- oeis: A224769