1317840

Appears in sequences

• a(n) = 31*binomial(2*n,n-4) + Sum_{i=1..n-4} binomial(2*n,n-4-i)*(4+i).at n=10A182025
• G.f. satisfies A(x) = 1 + x^3*A(x)^2*(1 + x*A(x)).at n=29A365723