Sum of the first n palindromes (A002113).

Terms

a(0) =1a(1) =3a(2) =6a(3) =10a(4) =15a(5) =21a(6) =28a(7) =36a(8) =45a(9) =56a(10) =78a(11) =111a(12) =155a(13) =210a(14) =276a(15) =353a(16) =441a(17) =540a(18) =641a(19) =752a(20) =873a(21) =1004a(22) =1145a(23) =1296a(24) =1457a(25) =1628a(26) =1809a(27) =2000a(28) =2202a(29) =2414