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 A367807 #13 Dec 02 2023 19:27:46 %S A367807 0,1,2,3,4,11,22,33,44,101,106,111,116,121,126,131,136,141,146,202, %T A367807 207,212,217,222,227,232,237,242,247,303,308,313,318,323,328,333,338, %U A367807 343,348,404,409,414,419,424,429,434,439,444,449,1001,1056,1111 %N A367807 Even palindromes, divided by 2. %H A367807 <a href="/index/Pac#palindromes">Index entries for sequences related to palindromes</a> %F A367807 a(n) = A029951(n)/2. %t A367807 Select[Range[0, 2222, 2], PalindromeQ]/2 %Y A367807 Cf. A029951. %K A367807 nonn,easy,base %O A367807 1,3 %A A367807 _Erick B. Wong_, Dec 01 2023, at the suggestion of Landon Wong