T(2n-1,n), array T as in A054144.

Terms

a(0) =1a(1) =14a(2) =84a(3) =410a(4) =1820a(5) =7648a(6) =31008a(7) =122584a(8) =475600a(9) =1818656a(10) =6874560a(11) =25742624a(12) =95645888a(13) =353032960a(14) =1295729664a(15) =4732541824a(16) =17211685120a(17) =62362187264a(18) =225201546240a(19) =810825419264