T(n,n-3), array T given by A047010.

Terms

a(0) =1a(1) =1a(2) =3a(3) =15a(4) =76a(5) =339a(6) =1420a(7) =5839a(8) =23688a(9) =95161a(10) =380150a(11) =1513029a(12) =6006246a(13) =23801014a(14) =94204653a(15) =372561353a(16) =1472622468a(17) =5818884732a(18) =22988198286a(19) =90809767935a(20) =358720596210