T(n,n-3), array T as in A047110.

Terms

a(0) =1a(1) =4a(2) =14a(3) =44a(4) =144a(5) =414a(6) =1348a(7) =3187a(8) =11000a(9) =67699a(10) =242110a(11) =907470a(12) =4048716a(13) =15792744a(14) =61270714a(15) =251463726a(16) =996295359a(17) =3916971576a(18) =15685208519a(19) =62232260683a(20) =245848928006a(21) =977038778501