-320

Appears in sequences

• Expansion of Product_{k>=1} (1 - x^k)^16.at n=3A000739
• Expansion of e.g.f. log(sech(x) + arctan(x)).at n=6A013205
• Expansion of tan(sin(x))*sin(x)/2.at n=4A024300
• McKay-Thompson series of class 10C for Monster.at n=31A058099
• Array of coefficients of polynomials p(n,x) = 2^(n-1)*Product_{i=0..n} (x - cos(i*Pi/n)) of degree (n+1) with P(-1,x) = 1, P(0,x) = 0.at n=52A076626
• Expansion of (1-x)/(1+2*x^2+2*x^3).at n=15A078037
• a(n) = (2^(n+1) + (-4)^n)/3.at n=5A083086
• Expansion of eta(q)^8 / eta(q^2)^4 in powers of q.at n=27A096727
• Difference between the number of even reduced Latin rectangles of size 3 X n and the number of odd ones.at n=5A098276
• Pseudo-factorials: a(0)=1, a(n+1) = (-1)^(n+1) * Sum_{k=0..n} binomial(n,k) * a(k)*a(n-k), n>=0.at n=6A098777
• Expansion of (1-16*x)/(1-20*x+80*x^2).at n=3A099841
• Triangle read by rows: T(n,k)=(-1)^k*(2n/(2n-k))5^(n-k)*binomial(2n-k,k) (0<=k<=n, n>=1).at n=42A104064
• Self-convolution 5th power equals A106222, which consists entirely of digits {0,1,2,3,4} after the initial terms {1,5}.at n=6A106223
• An alternating sum of greatest common divisors.at n=63A106475
• Triangle, read by rows, equal to the matrix inverse of Q=A113381.at n=42A114158
• Minimal determinant of real n X n symmetric (0,1) matrices.at n=9A118998
• Expansion of E(k) * K(k) * (2/Pi)^2 in powers of q^2 where E(), K() are complete elliptic integrals and the nome q = exp( -Pi * K(k') / K(k)).at n=28A122858
• Number triangle T(n,k)=(-1)^(n-k)*(3k+2)*C(3n+1, n-k)/(2n+k+2).at n=17A124821
• Irregular triangle, read by rows: T(n, k) = [x^k]( y(n, x) ), where y(n, x) = - 2*y(3, x) - x*y(n-1, x) + 2*x^2*y(n-1, x) + x^2*y(n-2, x), and y(1, x) = -8 - 3*x + 8*x^2, y(2, x) = 4 - 4*x - 10*x^2 + 4*x^3 + 4*x^4, y(3, x) = -8 + 4*x + 24*x^2 - 9*x^3 - 24*x^4 + 4*x^5 + 8*x^6.at n=60A131641
• Expansion of (eta(q) * eta(q^2) / (eta(q^5) * eta(q^10)))^2 in powers of q.at n=31A132041