250250

Appears in sequences

• Denominators of Van der Pol numbers.at n=10A003163
• Denominators of Blandin-Diaz compositional Bernoulli numbers (B^sin)_3,n.at n=5A132093
• Numbers k such that k and k^2 use only the digits 0, 2, 5 and 6.at n=34A136911
• Triangle T(m,n) read by rows: T(m,n) = Sum_{k=1..n} StirlingS2(m, n) * StirlingS2(m, k).at n=24A167128
• a(n) = n*(n+1)*(9*n^2 - n - 5)/6.at n=20A172075