2187900

Appears in sequences

• a(n) = binomial(n+4,4) * binomial(n+9,4).at n=9A104678
• a(n) = C(5+2*n,5+n)*C(10+2*n,0+n).at n=4A114253
• a(n) = (n + n^2)*binomial(2*n,n)/2.at n=9A119578
• Numbers with prime factorization pqrs^2t^2u^2.at n=17A190391
• GCD of A002443(n) and A002444(n), numerator and denominator in Feinler's formula for the Bernoulli number B_{2n}.at n=48A266911
• a(n) = denominator(Sum_{j=0..n} Bernoulli(j, 1) * Bernoulli(n - j, 1)).at n=16A363151
• a(n) = denominator(Sum_{j=0..2*n} Bernoulli(j, 1) * Bernoulli(2*n - j, 1)).at n=8A363152