-806

Appears in sequences

• Coefficients of modular function G_3(tau).at n=20A005761
• Reflected tetranacci numbers A073817.at n=25A074058
• Determinants of 2 X 2 matrices of non-overlapping blocks of 4 consecutive primes.at n=18A117027
• Logarithmic derivative of the q-exponential of x, E_q(x,q), evaluated at q=-x.at n=23A198262
• Expansion of f(-x)^3 * f(-x^2) * chi(-x^3)^3 in powers of x where chi(), f() are Ramanujan theta functions.at n=37A280328
• Triangle read by rows: T(n,k) = T(n-k,k-1) - 2*T(n-k,k) + T(n-k,k+1) with T(0,0) = 1 for 0 <= k <= A003056(n).at n=41A291940
• Expansion of Product_{k>=1} (1 - x^k)^A000593(k).at n=23A316366
• a(n) = Sum_{k=1..n} floor(n/k) * (-4)^(k-1).at n=5A344819
• Square array A(n,k), n >= 1, k >= 0, read by antidiagonals downwards, where A(n,k) = Sum_{j=1..n} floor(n/j) * (-k)^(j-1).at n=50A344824