1288729

Appears in sequences

• G.f. A(x) satisfies: A(x) = 1 + x * A(x)^7 / (1 + x).at n=7A349363
• a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n-1,k-1) * binomial(n*k,k) / ((n-1)*k+1).at n=7A378410