Round((n+1/n)^9).

Terms

a(0) =512a(1) =3815a(2) =50805a(3) =452377a(4) =2779906a(5) =12895977a(6) =48400258a(7) =154315776a(8) =432655358a(9) =1093685273a(10) =2539243268a(11) =5491371251a(12) =11182788770a(13) =21629362253a(14) =40008716648a(15) =71173490664a(16) =122332454247a(17) =203937787267a(18) =330822261551