a(n) = n^5 + 5*n + 5^n.

Terms

a(0) =1a(1) =11a(2) =67a(3) =383a(4) =1669a(5) =6275a(6) =23431a(7) =94967a(8) =423433a(9) =2012219a(10) =9865675a(11) =48989231a(12) =244389517a(13) =1221074483a(14) =6104053519a(15) =30518337575a(16) =152588939281a(17) =762940873067