53582400

Appears in sequences

• One quarter the number of n X 4 1..4 arrays with no two neighbors of any element equal to each other.at n=13A183356
• Squares that remain squares if you decrease them by a repunit with the same number of digits.at n=15A273229
• a(n) is the end of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245).at n=29A340662