-99450

Appears in sequences

• a(n) = (2^n/n!) * Product_{k=0..n-1} (4*k - 3).at n=8A004983
• G.f. A(x,y) satisfies: A(x,y) = x * (1 + y*A(x,y)*A'(x,y)) / (1 + A(x,y)*A'(x,y)), where A'(x,y) = d/dx A(x,y).at n=22A301930