This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A002108 #26 Oct 14 2023 22:32:45
%S A002108 1,61,18,652,526,6921,1042,6904,1656,1,14641,63702,16582,61483,52605,
%T A002108 63556,12538,679401,123031,61,184491,652432,148972,677133,526093,
%U A002108 679654,144135,656416,182707,18,125329,6758401,1295811,6336331,5260051,6169761
%N A002108 4th powers written backwards.
%H A002108 T. D. Noe, <a href="/A002108/b002108.txt">Table of n, a(n) for n = 1..1000</a>
%F A002108 From _Michel Marcus_, Jun 04 2019: (Start)
%F A002108 a(n) = A004086(A000583(n)).
%F A002108 a(n) = A002942(n^2). (End)
%F A002108 a(n * 10^k) = a(n) for k >= 1. - _Bernard Schott_, Jun 04 2019
%t A002108 FromDigits[Reverse[IntegerDigits[#]]]&/@(Range[40]^4) (* _Harvey P. Dale_, May 03 2012 *)
%o A002108 (PARI) a(n) = fromdigits(Vecrev(digits(n^4))); \\ _Michel Marcus_, Jun 04 2019
%Y A002108 Cf. A004086, A000583, A002942, A004165.
%Y A002108 {This sequence} Intersection A000583 = A186080 (palindromes).
%K A002108 nonn,base
%O A002108 1,2
%A A002108 _N. J. A. Sloane_