63690

Appears in sequences

• Values of k such that k - 1 and k + 1 are twin primes and 3*k^9 - 1 and 3*k^9 + 1 are also twin primes.at n=4A108134
• Species of ordered Latin bi-trades of size n.at n=15A133173
• Triangle read by rows giving numbers H(n,k), number of classes of twin-tree-rooted maps with n edges whose root bond contains k edges.at n=41A260040
• a(n) = [x^n] Product_{k=0..n-1} (1 + k*x)^3.at n=5A384018
• a(n) = Sum_{k=0..n} 3^k * binomial(n+2,k+2) * binomial(2*k+4,k+4).at n=4A387310