134640

Appears in sequences

• Theta series of 10-d 11-modular Craig lattice A_10^(3).at n=19A028995
• Number of arrangements of n labeled balls in n labeled columns where only 1 column may have more than 1 ball.at n=5A086984
• Smallest perimeter S such that exactly n distinct Pythagorean triangles with this perimeter can be constructed.at n=34A099830
• Negative value of coefficient of x^(n-3) in the characteristic polynomial of a certain n X n integer circulant matrix.at n=9A127408
• Numbers with prime factorization pqrs^2t^4.at n=10A190384
• Positive numbers differing from next 3 greater squares by squares.at n=11A218487
• Least number, m, such that m^2 is expressible in just n ways as (p+1)(q+1) where p and q are distinct primes.at n=43A274877
• a(1)=1, a(2)=2; thereafter a(n) = (1/n!)*Sum_{i=0..floor(n/2)} 4*(2*n+1)!*(2*n-i-4)!/(i!*(n-i-2)!*(2*n-i+1)).at n=3A329775
• a(n) = (1/n!)*Sum_{i=0..n-2} 4*(2*n+1)!*(2*n-i-4)!/(i!*(n-i-2)!*(2*n-i+1)).at n=3A329776
• Totient numbers where a record gap appears in the list (A002202).at n=12A392633