T(2n+1,n), array T as in A054134.

Terms

a(0) =1a(1) =9a(2) =46a(3) =264a(4) =1602a(5) =9981a(6) =63068a(7) =402058a(8) =2579386a(9) =16629321a(10) =107637426a(11) =699032274a(12) =4552606344a(13) =29722287276a(14) =194458646688