306495

Appears in sequences

• Odd doubly abundant numbers (A125639).at n=24A129087
• G.f.: exp( Sum_{n>=1} [Sum_{k=0..2n} C(2n,k)^2*y^k]*x^n/n ) = Sum_{n>=0,k=0..2n} T(n,k)*x^n*y^k, as a triangle of coefficients T(n,k) read by rows.at n=42A181145
• Main diagonal of triangle A181145.at n=6A181146