18345600

Appears in sequences

• a(n) = n(n+1)(n+2)...(n+8) / (n+(n+1)+(n+2)+...+(n+8)).at n=7A032780
• a(n) = denominator of b(n), where b(1) = 1, b(n) = Sum_{k=1..n-1} b(n-k) * H(k); H(k) = Sum_{j=1..k} 1/j, the k-th harmonic number.at n=14A128045
• Triangle used for the integral of even powers of the sine and cosine functions.at n=31A254933