-521

Appears in sequences

• Fibonacci-type sequence based on subtraction: a(0) = 1, a(1) = 2 and a(n) = a(n-2) - a(n-1).at n=14A061084
• a(0)=-1, a(1)=-1, a(n)=-3*a(n-1)-a(n-2) for n>1.at n=7A098149
• Alternating sum of diagonals in A060177.at n=48A104575
• Expansion of (1 - x)*(1 + x)^2*(1 + x^2)*(1 - x^2 + 2*x^3 + x^4) / ((1 - x^2 - x^4)*(1 + x^2 + 2*x^4 - x^6 + x^8)).at n=26A107363
• Expansion of (1-5x^2-7x^3-2x^4+x^6)/((1-x)(1-x^3)^2).at n=27A141365
• a(n) = n^3 - (3*(n+3))^2.at n=10A153259
• Expansion of 1/(x^11 + x^10 + x^6 + x^5 + x^4 + x^2 + 1).at n=48A157746
• Triangle read by rows : T(n,0) = n+1, T(n,k)=0 if k<0 or if k>n, T(n,k) = k*T(n-1,k) - T(n-1,k-1).at n=52A159881
• Values of n such that L(5) and N(5) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=25A226925
• Expansion of f(-x^2)^2 * f(-x, x^2) / f(x^3)^3 in powers of x where f(,) is Ramanujan's general theta function.at n=39A254525
• Expansion of 1 + x*(1-x)/(1 + x^2*(1-x^2)/(1 + x^3*(1-x^3)/(1 + x^4*(1-x^4)/(1 + x^5*(1-x^5)/(1 + ...))))), a continued fraction.at n=30A291193
• Expansion of 1 - x*(1+x)/(1 + x^2*(1-x^2)/(1 - x^3*(1+x^3)/(1 + x^4*(1-x^4)/(1 - x^5*(1+x^5)/(1 - ...))))), a continued fraction.at n=30A291200
• Expansion of x*(1 - 4*x)^(3/2)/(3*x - 1)^2.at n=7A320826
• Expansion of 1 / (1 + Sum_{k>=1} mu(k)^2 * x^k).at n=33A329099
• Numerators of the coefficients in a series for the angles in the Spiral of Theodorus.at n=6A351861
• Expansion of e.g.f. 1/(exp(x) - x^2).at n=5A352302
• a(n) = A325977(A228058(n)).at n=32A389217