261780

Appears in sequences

• Expansion of (1-3*x-sqrt(9*x^2-10*x+1))/(2*x).at n=7A082298
• Triangle read by rows: T(n, k) = Sum_{d=0..n-k} binomial(n, d)*StirlingS2(n-d, k)*63^(n-d-k), with 0 <= k <= n.at n=25A364072