T(n,n+1), array T as in A047040; T(n+1,n), array T given by A047050.

Terms

a(0) =1a(1) =2a(2) =5a(3) =14a(4) =42a(5) =146a(6) =513a(7) =1814a(8) =6457a(9) =23852a(10) =88822a(11) =331756a(12) =1241569a(13) =4704536a(14) =17919729a(15) =68426280a(16) =261659138a(17) =1005583928a(18) =3876858984a(19) =14975423376a(20) =57918225459a(21) =224542599510a(22) =872234912198