Central factorial numbers: column 2 in triangle A008956.

Terms

a(0) =0a(1) =9a(2) =259a(3) =1974a(4) =8778a(5) =28743a(6) =77077a(7) =179452a(8) =375972a(9) =725781a(10) =1312311a(11) =2249170a(12) =3686670a(13) =5818995a(14) =8892009a(15) =13211704a(16) =19153288a(17) =27170913a(18) =37808043a(19) =51708462a(20) =69627922a(21) =92446431a(22) =121181181a(23) =157000116a(24) =201236140a(25) =255401965a(26) =321205599a(27) =400566474a(28) =495632214