490100domain: NAppears in sequencesSquare roots of sums of squares of divisors in A046655.at n=31A046656Number of nonoverlapping placements of one 1 X 1 square and one 2 X 2 square on an n X n board.at n=26A173963Number of multisets of n nonempty words with a total of 2n letters over binary alphabet.at n=9A359962