T(n,n-4), array T as in A038730.

Terms

a(0) =1a(1) =10a(2) =57a(3) =245a(4) =888a(5) =2881a(6) =8679a(7) =24872a(8) =68940a(9) =186953a(10) =499927a(11) =1325204a(12) =3494249a(13) =9184675a(14) =24098536a(15) =63165197a(16) =165471668a(17) =433350754a(18) =1134715190a(19) =2970971916a(20) =7778430788a(21) =20364616458a(22) =53315795326a(23) =139583244540