a(n) = 9*binomial(2*n,n)^2 - 8*binomial(3*n,n).

A357568

a(n) = 9*binomial(2*n,n)^2 - 8*binomial(3*n,n).

Terms

    a(0) =1a(1) =12a(2) =204a(3) =2928a(4) =40140a(5) =547512a(6) =7535472a(7) =105077376a(8) =1484848332a(9) =21237645000a(10) =306972655704

External references