-11355

Appears in sequences

• Coefficients of powers of x^2 of polynomials, called h(2,n,x^2), appearing in a conjecture on alternating sums of fifth powers of odd-indexed Chebyshev S polynomials stated in A220671.at n=25A220672
• The unique sequence such that Sum_{d|n} d*a(d)^(n/d) = sigma(n)^2 for every n.at n=20A383614