-30720

Appears in sequences

• a(n)=(5-(-1)^n-6*n)*2^(n-2).at n=11A179609
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of max(3i-j, 3j-i), as in A204156.at n=21A204157
• Irregular triangle T(n,k) read by rows of the reduced coefficients of Pi^(2*k) in the expansion of Sum_{k>=1} (1 / (4*k^2-1)^n).at n=11A382782