a(n) = Sum_{j=0..10} n^j.

Terms

a(0) =1a(1) =11a(2) =2047a(3) =88573a(4) =1398101a(5) =12207031a(6) =72559411a(7) =329554457a(8) =1227133513a(9) =3922632451a(10) =11111111111a(11) =28531167061a(12) =67546215517a(13) =149346699503a(14) =311505013051a(15) =617839704241