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

Terms

a(0) =1a(1) =5a(2) =28a(3) =132a(4) =574a(5) =2380a(6) =9560a(7) =37536a(8) =144872a(9) =551696a(10) =2078464a(11) =7761600a(12) =28771168a(13) =105985984a(14) =388336256a(15) =1416262656a(16) =5144067200a(17) =18616720640a(18) =67159278592a(19) =241579840512a(20) =866744413696