210000000000domain: NAppears in sequences10th binomial transform of (1,1,0,0,0,0,...).at n=11A081122a(n) = (2*n-1)*(n-1)^(n-1).at n=11A176043Determinant of the n X n matrix with (i,j)-entry equal to the greatest common divisor of i-j and n.at n=11A228884