-6813

Appears in sequences

• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of the symmetric matrix A202873; by antidiagonals.at n=25A202767
• Coefficients in the expansion of 1/([r] + [2r]x + [3r]x^2 + ...); [ ] = floor, r = sqrt(3).at n=31A279588
• a(n) = Sum_{d divides n} (-1)^(d + n/d) * d^3.at n=17A321559