108699

Appears in sequences

• Let r, s, t be three permutations of the set {1,2,3,..,n}; a(n) = value of Sum_{i=1..n} r(i)*s(i)*t(i), with r={1,2,3,..,n}; s={n,n-1,..,1} and t={n,n-2,n-4,...,1,...,n-3,n-1}.at n=34A070893
• Quintisection of 1/(1-x^5-x^6).at n=21A099132
• Numerator of n-th partial sum of the Van der Waerden-Ulam binary measure of the primes.at n=15A127200
• Number of permutation symbols of type *a(n) for hyperbolic archimedean tessellations of rank n.at n=17A142870
• A bisection of A142870.at n=8A142876
• Number of compositions of 6*n-3 into parts 5 and 6.at n=17A373963
• Expansion of e.g.f. exp( exp( (exp(2*x)-1)/2 ) - 1 ).at n=7A380228
• a(n) = Sum_{k=0..floor(2*n/5)} binomial(k+1,2*n-5*k).at n=50A390020
• a(n) = Sum_{k=0..floor(3*n/5)} binomial(k,3*n-5*k).at n=35A392271