3091200

Appears in sequences

• G.f. A(x) satisfies: A(x) = 1/(1 - x*A(x)/(1 - 4*x*A(x)/(1 - 9*x*A(x)/(1 - 16*x*A(x)/(1 - ... - k^2*x*A(x)/(1 - ...)))))), a continued fraction.at n=6A301834
• Square array A(n,k) = A388978(A388981(n, k)), read by descending antidiagonals.at n=41A389168