-2140

Appears in sequences

• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of f(i,j)=max(ceiling(i/j),ceiling(j/i)) (as in A204143).at n=38A204144
• Expansion of f(-q)^10 / f(-q^5)^2 in power of q where f() is a Ramanujan theta function.at n=17A243939
• Expansion of 1 / (chi(x) * chi(x^7)) in powers of x where chi() is a Ramanujan theta function.at n=41A246762
• Product_{n>=1} (1 + a(n)*x^n) = 1 + Sum_{n>=1} x^prime(n).at n=65A348128