Expansion of (1+15*x+15*x^2+x^3)/(1-x)^12.

Terms

a(0) =1a(1) =27a(2) =273a(3) =1715a(4) =8007a(5) =30381a(6) =98735a(7) =284349a(8) =742950a(9) =1791426a(10) =4037670a(11) =8591154a(12) =17392258a(13) =33711510a(14) =62886162a(15) =113381398a(16) =198287439a(17) =337392405a(18) =560004575a(19) =908737245a(20) =1444515345a(21) =2253115995a(22) =3453615945a(23) =5209188075a(24) =7740767580a(25) =11344196916a(26) =16411557852