Central terms of triangle in A075383.

Terms

a(0) =1a(1) =6a(2) =15a(3) =28a(4) =90a(5) =66a(6) =91a(7) =285a(8) =153a(9) =190a(10) =588a(11) =276a(12) =800a(13) =972a(14) =435a(15) =496a(16) =1485a(17) =1750a(18) =703a(19) =2223a(20) =861a(21) =989a(22) =3060a(23) =1175a(24) =3136a(25) =3723a(26) =1431a(27) =4290a(28) =4731a(29) =1829