T(2n,n), array T as in A047100.

Terms

a(0) =1a(1) =1a(2) =5a(3) =31a(4) =151a(5) =917a(6) =5619a(7) =33627a(8) =210911a(9) =1326395a(10) =8366161a(11) =53441835a(12) =342477957a(13) =2203613164a(14) =14248253995a(15) =92379163952a(16) =600644552471