179928

Appears in sequences

• Number of perfect matchings in graph C_{6} X P_{n}.at n=7A028477
• Expansion of g.f. x^2/(1 - 2*x - 25*x^2).at n=8A123004
• a(n) = gcd(n!, binomial(2n,n)).at n=26A135322
• Nonzero coefficients of g.f.: A(x) = G(G(G(G(x)))) where G(x) = x + G(G(x))^3 is the g.f. of A153851.at n=5A153854
• Numbers with prime factorization pq^2r^3s^3.at n=22A190320
• Number of perfect matchings in the P_7 X C_{2n} graph.at n=1A254635
• a(n) = binomial(2*n, n) / Product(p prime | n < p <= 2*n).at n=26A263931
• Triangle read by rows: T(n, k) = binomial(2*n, n + k) * binomial(n + 1, k)/(n + 1).at n=49A286784
• Triangle T(n,m) read by rows: Sum_{k=1..m} binomial(2*n, n+k)*d(k), m<=n, with d(k)=A000005(k).at n=42A351145
• Triangle read by rows: T(n,k) = binomial(n+1,k+1) * binomial(3*n-2*k+1,k) / (n+1), 0<=k<=n.at n=50A391046