2798929domain: NAppears in sequencesNumber of 6Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 1 0 and 1 0 1 vertically.at n=7A207952Square numbers whose sum of square divisors is also square.at n=6A232554Powerful numbers (A001694) whose sum of powerful divisors (including 1) is also powerful.at n=27A349109