T(n,n+2), array T as in A047060.

Terms

a(0) =1a(1) =2a(2) =3a(3) =14a(4) =23a(5) =99a(6) =476a(7) =1966a(8) =7724a(9) =31653a(10) =126512a(11) =507276a(12) =2018121a(13) =7971668a(14) =31546299a(15) =124652979a(16) =492665697a(17) =1946183485a(18) =7681374157a(19) =30319084008a(20) =119668878738a(21) =472411463247