-1953

Appears in sequences

• Irregular triangle read by rows: coefficients of Olinde Rodrigues recursive polynomial for inversions of permutations applied to Bonnaci type polynomials: x - 1, x^2 - x - 1, x^3 - x^2 - x - 1, etc.at n=69A133333
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of (3i-2 if i=j and = 0 otherwise), as in A204160.at n=32A204161
• a(n) = Sum_{k=0..n-1} (-1)^k*A000172(k).at n=6A207318
• Expansion of exp( Sum_{n>=1} -sigma_2(3*n)*x^n/n ) in powers of x.at n=10A283243
• a(n) = Sum_{d|n} (-1)^(d-1)*d^2.at n=49A321543