Palindromes of form k*(k+7).

Terms

a(0) =0a(1) =8a(2) =44a(3) =494a(4) =858a(5) =49494a(6) =445544a(7) =819918a(8) =4462644a(9) =8853588a(10) =8913198a(11) =81099018a(12) =441525144a(13) =882060288a(14) =8100990018a(15) =44105250144a(16) =49781418794a(17) =85831713858a(18) =447597795744a(19) =810009900018a(20) =889249942988