61274domain: NAppears in sequencesa(n) = smallest exponent k such that the string "1 2 ... n" appears in the decimal expansion of 2^k.at n=8A171768Number of (3+1) X (n+1) 0..1 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.at n=8A250800