130339

Appears in sequences

• Negative value of coefficient of x^(n-2) in the characteristic polynomial of a certain n X n integer circulant matrix.at n=32A127407
• a(n) = Sum_{k=1..n} gcd(k, n)^4.at n=18A343498
• a(n) = Sum_{k=0..floor(n/3)} (-1)^k * binomial(2*n+2,n-3*k).at n=9A371820