Central terms of the triangle A182579.

Terms

a(0) =1a(1) =1a(2) =4a(3) =5a(4) =20a(5) =27a(6) =112a(7) =156a(8) =660a(9) =935a(10) =4004a(11) =5733a(12) =24752a(13) =35700a(14) =155040a(15) =224808a(16) =980628a(17) =1427679a(18) =6249100a(19) =9126975a(20) =40060020a(21) =58659315a(22) =258048960a(23) =378658800a(24) =1668903600a(25) =2453288292a(26) =10829900592a(27) =15944020316a(28) =70480305440a(29) =103897691640