272835

Appears in sequences

• a(n) = Sum_{k=0..n} binomial(n,k)^2 * binomial(2*k,k).at n=7A002893
• Square array A(n,k) = (n!)^2 [x^n] BesselI(0, 2*sqrt(x))^k read by antidiagonals.at n=62A287316