101538

Appears in sequences

• Sets of 4 numbers in arithmetic progression with common difference 6 and whose phi values are equal.at n=14A039670
• Triangle read by rows: T(n,k) = number of n-element unlabeled N-free posets of height k (1 <= k <= n).at n=60A202181
• a(0) = 1 and a(n) = (1/n) * Sum_{k=1..n} binomial(n,k) * binomial(n+(n-1)*k,k-1) for n > 0.at n=6A335871
• G.f. A(x) satisfies A(x) = 1 + x*A(x)^6/(1 - x*A(x)).at n=6A378691