67108878domain: NAppears in sequencesa(n) = the smallest positive multiple of n with exactly n digits when written in binary.at n=26A162213Number of (n+1) X (3+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nonincreasing x(i,j)-x(i-1,j) in the j direction.at n=24A250737