106234700

Appears in sequences

• Number of partitions of an n-gon into (n-5) parts.at n=9A002060
• Expansion of 1/(1-4*x)^(9/2).at n=9A020920
• Denominator of sum of all elements M(i,j,k) = i*j/k, (i,j,k = 1..n). a(n) = Denominator[Sum[Sum[Sum[i*j/k,{i,1,n}],{j,1,n}],{k,1,n}]].at n=26A099866
• a(n) = lcm{1, 2, ..., n}/(n*(n-1)), n >= 2.at n=26A099946
• Denominators of 2*Sum_{k=1..n} 1/binomial(2*k,k), n >= 1.at n=12A130546
• Denominators of 6*(sum(1/binomial(2*k,k),k=1..n)-1/3), n>=1.at n=12A130548
• Denominators of the Harary index of the n X n grid graph.at n=13A296192
• a(n) = lcm(denominator(p(n, x))), where p(n, x) are the rational polynomials defined in A342321.at n=25A343277
• a(n) = (1+(-1)^n)/2*4^n*(C((3*n)/2-1,n))+(1-(-1)^n)/2*((C((3*n-1)/2,n))*(C(3*n-1,(3*n-1)/2)))/(C(n-1,(n-1)/2)).at n=9A348618