28061890

Appears in sequences

• G.f. A(x,y) satisfies: A( x - y*A(x,y)^2, y) = x + (1-y)*A(x,y)^2, where the coefficients T(n,k) of x^n*y^k form a triangle read by rows n>=1, for k=0..n-1.at n=68A277295
• Column 2 of triangle A277295; a(n) = A277295(n+2,2).at n=9A277296