knbishops[k_,n_]:=(如果[n==1,如果[k==1、1、0],(-1)^k/(2n-k)!
*求和[二项式[2n-k,n-k+i]*求和[(-1)^m*二项式[n-i,m]*m^Floor[n/2]*(m+1)^Floor[(n+1)/2],{m,1,n-i}]
*求和[(-1)^m*二项式[n-k+i,m]*m^Floor[(n+1)/2]*(m+1)^Floor[n/2],{m,1,n+i-k}],{i,Max[0,k-n],Min[k,n]}]);
表[1+总和[knbishops[k,n],{k,1,2n-1}],{n,1,25}]