%This program enumerates the number of walks that reach the point x after
%N steps.
%N total number of steps
function nW=getNW(N,x)
if abs(x)>N
    nW=0;
else
    if N==1
        nW=1;
    else
        nW=getNW(N-1,x-1)+getNW(N-1,x+1);
    end
end