Triangle read by rows, T(n,k) = C(n,k)*n!/(floor(n/2)!)^2, n>=0, 0<=k<=n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =2a(6) =6a(7) =18a(8) =18a(9) =6a(10) =6a(11) =24a(12) =36a(13) =24a(14) =6a(15) =30a(16) =150a(17) =300a(18) =300a(19) =150a(20) =30a(21) =20a(22) =120a(23) =300a(24) =400a(25) =300a(26) =120a(27) =20a(28) =140a(29) =980