Binomial coefficients C(2*n-6,7).

Terms

a(0) =8a(1) =120a(2) =792a(3) =3432a(4) =11440a(5) =31824a(6) =77520a(7) =170544a(8) =346104a(9) =657800a(10) =1184040a(11) =2035800a(12) =3365856a(13) =5379616a(14) =8347680a(15) =12620256a(16) =18643560a(17) =26978328a(18) =38320568a(19) =53524680a(20) =73629072a(21) =99884400a(22) =133784560a(23) =177100560a(24) =231917400a(25) =300674088a(26) =386206920a(27) =491796152a(28) =621216192