a(n) = 2*n^2*binomial(2*n,n)^2, a closed form for a double binomial sum involving absolute values.

A254408

a(n) = 2*n^2*binomial(2*n,n)^2, a closed form for a double binomial sum involving absolute values.

Terms

    a(0) =0a(1) =8a(2) =288a(3) =7200a(4) =156800a(5) =3175200a(6) =61471872a(7) =1154305152a(8) =21201523200a(9) =382952512800

External references