a(n) = 14*binomial(n,8).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =14a(9) =126a(10) =630a(11) =2310a(12) =6930a(13) =18018a(14) =42042a(15) =90090a(16) =180180a(17) =340340a(18) =612612a(19) =1058148a(20) =1763580a(21) =2848860a(22) =4476780a(23) =6864396a(24) =10296594a(25) =15142050a(26) =21871850a(27) =31081050a(28) =43513470a(29) =60090030