1758276domain: NAppears in sequencesSquares of even triangular numbers.at n=24A014738Squares of even hexagonal numbers.at n=12A014772Numbers with prime factorization p^2*q^2*r^2*s^2 where p, q, r, and s are distinct primes.at n=25A190377Number of subsets of {1,2,...,n-8} without differences equal to 2, 4, 6 or 8.at n=56A224811