T(n,n+3), array T as in A047110.

Terms

a(0) =1a(1) =4a(2) =14a(3) =53a(4) =195a(5) =711a(6) =2662a(7) =9973a(8) =37367a(9) =141472a(10) =537422a(11) =2045224a(12) =7821958a(13) =30001955a(14) =115296650a(15) =444336395a(16) =1716137440a(17) =6639137474a(18) =25732460158a(19) =99897347527a(20) =388339939659