-2025

Appears in sequences

• McKay-Thompson series of class 14a for Monster.at n=10A058505
• Expansion of (1-x) / (1+x^2+2*x^3).at n=23A078033
• Determinant of the n X n tridiagonal matrix M with the elements on the diagonals equal to 1, except M(n,n-1)=M(n-1,n)=n.at n=43A080322
• Triangle read by rows: T[n, m] = Sum[m^3 - 3*m^2*k + 3*m*k^2 - k^3, {k, 0, n - 1}] + m^4.at n=55A121721
• a(n) = (-1)^(n-3)*binomial(n,3) - 1.at n=21A216414
• Difference between sums of quadratic residues and non-residues modulo n (residues are not necessarily coprime to n).at n=89A255644
• Determinants of the Hankel matrices for the period-doubling sequence A035263.at n=30A265025
• Alternating sum of centered 25-gonal numbers.at n=17A270693