a(n) = 3*binomial(4*n,n) - 20*binomial(3*n,n) + 54*binomial(2*n,n).

A357955

a(n) = 3*binomial(4*n,n) - 20*binomial(3*n,n) + 54*binomial(2*n,n).

Terms

    a(0) =37a(1) =60a(2) =108a(3) =60a(4) =-660a(5) =60a(6) =82404a(7) =1411848a(8) =17540460a(9) =191318820a(10) =1952058108a(11) =19175376324a(12) =184118073828

External references