T(5,n) with T(n,m) as in A063394.

Terms

a(0) =1a(1) =63a(2) =255a(3) =863a(4) =2655a(5) =7683a(6) =21287a(7) =57071a(8) =149087a(9) =381311a(10) =958207a(11) =2372095a(12) =5796863a(13) =14007295a(14) =33511423a(15) =79466495a(16) =186949631a(17) =436666367a(18) =1013317631a(19) =2337538047a(20) =5362941951a(21) =12242386943a(22) =27817148415a(23) =62934482943a(24) =141815709695a(25) =318372839423a(26) =712243150847