Duplicate of A073532.

Terms

a(0) =4a(1) =20a(2) =97a(3) =510a(4) =2529a(5) =10239a(6) =33950a(7) =90510a(8) =145227a(9) =0a(10) =0a(11) =0a(12) =0a(13) =0a(14) =0a(15) =0a(16) =0a(17) =0a(18) =0a(19) =0a(20) =0a(21) =0a(22) =0