78354

Appears in sequences

• Expansion of 1/((1+x)*(1-x)^9).at n=12A001780
• Engel expansion of gamma^2, (gamma is the Euler-Mascheroni constant A001620) = 0.333178.at n=18A059190
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of the symmetric matrix A202674 based on (1,3,5,7,9,...); by antidiagonals.at n=41A202675
• Number of 6Xn 0..1 arrays with rows unimodal and columns nondecreasing.at n=7A225013
• Number of n-node rooted identity trees of height 9.at n=10A229403
• a(n) = Sum_{k=0..n} binomial(n,k)*k!!*(n - k)!!.at n=9A305578