226548domain: NAppears in sequencesa(n) = 784*n^2 - 28.at n=16A158657Triangle T(n,m) read by rows, obtained from [A(x)]^m = Sum_{n>=m} T(n,m)*x^n, where A(x) (the g.f. for A069271) satisfies 2*x^2*A(x)^3 = 1 - 2*x*A(x) - sqrt(1-4*x*A(x)).at n=48A188108a(n) = 2*binomial(4*n + 8, n)/(n + 2).at n=6A233666