A transform of C(n,7).

Terms

a(0) =1a(1) =8a(2) =72a(3) =480a(4) =2640a(5) =12672a(6) =54912a(7) =219648a(8) =823680a(9) =2928640a(10) =9957376a(11) =32587776a(12) =103194624a(13) =317521920a(14) =952565760a(15) =2794192896a(16) =8033304576a(17) =22682271744a(18) =63006310400a(19) =172438323200a(20) =465583472640