25564

Appears in sequences

• Maximum value taken on by f(P) = Sum_{i=1..n} p(i)*p(n+1-i) as {p(1),p(2),...,p(n)} ranges over all permutations P of {1,2,3,...,n}.at n=42A087035
• Number of rooted 2-dimensional polyominoes with n hexagonal cells, with no symmetries removed.at n=6A094165
• Array read by antidiagonals: T(n,k) = number of rooted 2-dimensional polyominoes with k cells, the cells being regular n-gons, with no symmetries removed.at n=51A094166
• Numbers k such that floor((prime(k)/k)^k) is prime.at n=7A121624
• Expansion of o.g.f. (1-x^2+x^4)/((1-x)^2*(1-x^2)^4*(1-x^3)^4).at n=19A123991
• Number of unlabeled maximal independent sets in the n-cycle graph.at n=49A127687
• Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y<3z.at n=14A212512
• Edge count of the n X n white bishop graph.at n=42A289179
• Number of cyclic binary sequences of length n containing no abelian 4th powers.at n=39A305594
• Number of maximal subsets of {1..n} containing no products of distinct elements.at n=42A325710
• Number of maximal subsets of {1..n} containing no products of distinct elements.at n=43A325710
• Starts of runs of 3 consecutive Zeckendorf-Niven numbers (A328208).at n=24A328210
• a(n) is the number of 5 element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units with a trapezoid filled by 3 trapezoids.at n=28A391204