270314

Appears in sequences

• a(n) = (-1)^n * Sum_{k=0..n} (-2)^k * binomial(n,k) * binomial(n^2+k+1,n)/(n^2+k+1).at n=6A336495
• G.f. A(x) satisfies A(x) = 1 + x*A(x)^7/(1 - x*A(x)^6).at n=6A378694