a(n) = C(n)*C(n+2), where C(n) is the n-th Catalan number A000108(n).

A342288

a(n) = C(n)*C(n+2), where C(n) is the n-th Catalan number A000108(n).

Terms

    a(0) =2a(1) =5a(2) =28a(3) =210a(4) =1848a(5) =18018a(6) =188760a(7) =2085798a(8) =24018280a(9) =285817532a(10) =3493769552a(11) =43672119400a(12) =556315613280

External references