-1518

Appears in sequences

• Expansion of (1-3x)/(1-x^2+x^3).at n=25A117374
• Sum of the n-th powers of the roots of the (reduced) weight enumerator of the extended Golay code (1 + 759*x^2 + 2576*x^3 + 759*x^4 + x^6).at n=2A122192
• 1-gonal pyramidal numbers.at n=21A254749
• Difference between sums of quadratic residues and non-residues modulo n that are coprime to n.at n=98A255643