173964domain: NAppears in sequencesG.f. A(x) = Sum_{n>=0} a(n)*x^n satisfies: [Sum_{n>=0} x^n/(1 - x^(n+1))]^4 = Sum_{n>=0} a(n)*x^n/(1 - x^(n+1))^4.at n=27A341375a(n) = Sum_{k=0..floor(4*n/7)} binomial(k+1,4*n-7*k).at n=36A390218