T(n,n+2), array T as in A047150.

Terms

a(0) =1a(1) =2a(2) =3a(3) =24a(4) =104a(5) =316a(6) =1347a(7) =5007a(8) =19908a(9) =78909a(10) =300750a(11) =1172598a(12) =4544071a(13) =17726423a(14) =69374599a(15) =270603617a(16) =1057755306a(17) =4135771322a(18) =16192627389a(19) =63483189171a(20) =248975461678a(21) =977164006398