T(n,n+2), array T as in A047140.

Terms

a(0) =1a(1) =2a(2) =5a(3) =24a(4) =38a(5) =96a(6) =843a(7) =3840a(8) =12244a(9) =41612a(10) =186870a(11) =785256a(12) =2921302a(13) =10834752a(14) =43743005a(15) =176571744a(16) =684645006a(17) =2630576822a(18) =10387337222a(19) =41267967576a(20) =161904551038a(21) =631554736186