T(n,n+3), array T as in A047150.

Terms

a(0) =1a(1) =3a(2) =7a(3) =36a(4) =54a(5) =449a(6) =1592a(7) =7243a(8) =30636a(9) =115153a(10) =466704a(11) =1833753a(12) =7311539a(13) =29170551a(14) =114837610a(15) =453949280a(16) =1790444065a(17) =7070681835a(18) =27947590455a(19) =110325729977a(20) =435614497712