((n+3)!/6)*product( 2*k+1, k=0..n).A014130((n+3)!/6)*product( 2*k+1, k=0..n).Terms a(0) =1a(1) =12a(2) =300a(3) =12600a(4) =793800a(5) =69854400a(6) =8172964800External referencesoeis: A014130