234000

Appears in sequences

• Number of ways to place two nonattacking queens on an n X n board.at n=26A036464
• Triangle read by rows: T(n,k) is the number of partitions of the set {1,2,...,n} having exactly k blocks that contain both odd and even entries (0<=k<=floor(n/2)).at n=39A124418
• a(n) = Product_{k>=0} (1 + floor(n/2^k)).at n=38A132269
• Numbers with exactly four distinct exponents in their prime factorization, or four distinct parts in their prime signature.at n=15A323025
• Numbers whose square can be represented in exactly three ways as the sum of a positive square and a positive fourth power.at n=19A345968
• Largest n-phobe number.at n=9A349188
• a(n) is the smallest number k >= 1 that has exactly n divisors in A020487.at n=34A368215