T(n,n+3), array T as in A047040; T(n+3,n), array T given by A047050.

Terms

a(0) =1a(1) =4a(2) =14a(3) =48a(4) =165a(5) =586a(6) =2114a(7) =7694a(8) =28173a(9) =104370a(10) =389751a(11) =1463288a(12) =5514820a(13) =20894454a(14) =79510118a(15) =303570094a(16) =1161991698a(17) =4460728710a(18) =17168879077a(19) =66225380848a(20) =255907081225a(21) =990671100502