a(n) = n^11 + 11*n + 11^n.

Terms

a(0) =1a(1) =23a(2) =2191a(3) =178511a(4) =4208989a(5) =48989231a(6) =364568683a(7) =1996813991a(8) =8804293561a(9) =33739007399a(10) =125937424711a(11) =570623341343