2771340

Appears in sequences

• Coefficients of Legendre polynomials.at n=7A001802
• a(n) = lcm_{k=1..n} (lcm(n,n-1,...,n-k+2,n-k+1)/lcm(1,2,...,k)).at n=19A093432
• G.f.: 3F2([1/9, 2/9, 8/9], [2/3,1], 729 x).at n=3A275054
• a(n) = (20*n)!*n!/((10*n)!*(8*n)!*(3*n)!).at n=1A295471
• Least k such that Sum_{i=1..n} k^i / i is a positive integer.at n=19A333072
• Denominator of 2*Sum_{k=0..n} binomial(n,k)^2*binomial(n+k,k)^2*(H(n+k)-H(n-k)) where H(n) = Sum_{k=1..n} 1/k.at n=19A334887
• a(n) = lcm(denominator(p(n, x))), where p(n, x) are the rational polynomials defined in A342321.at n=19A343277
• G.f.: Sum_{n=-oo..+oo} x^(n*(n+1)/2) * C(x)^(4*n-6), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).at n=31A355864
• a(n) = (10*n)!*(n/2)!/((5*n)!*(4*n)!*(3*n/2)!).at n=2A364179