a(n) = 12 * C(2n+1,n-5) / (n+7).

Terms

a(0) =1a(1) =12a(2) =90a(3) =544a(4) =2907a(5) =14364a(6) =67298a(7) =303600a(8) =1332045a(9) =5722860a(10) =24192090a(11) =100975680a(12) =417225900a(13) =1709984304a(14) =6962078952a(15) =28192122176a(16) =113649492522a(17) =456442180920