18247680

Appears in sequences

• Denominators in expansion of exp(exp(x)-1)/(2-x).at n=11A058816
• a(n) = phi(binomial(2*n,n)*n^2).at n=11A131681
• Table read by rows. Coefficients of Lommel polynomials L(n, m, z) = (Gamma(n + m) / (Gamma(n) * (z/2)^m)) * hypergeom([(1 - m)/2, -m/2], [n, -m, 1 - n - m], z^2) for n = m and descending powers.at n=26A171636
• The number of integers r such that all primes above a certain value have the form primorial(n)*q +- r.at n=8A307826
• a(n) = Sum_{k=0..floor(n/3)} 2^k * 3^(n-3*k) * binomial(k,4*(n-3*k)).at n=38A392074