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 A168647 #12 Apr 08 2022 17:40:45 %S A168647 1,1,1,1,11,1,1,21,111,1,1,31,321,1111,1,1,41,631,4321,11111,1,1,51, %T A168647 51,731,54321,111111,1,1,61,561,251,51731,654321,1111111,1,1,71,181, %U A168647 5861,53251,171731,7654321,11111111,1,1,81,891,6681,2961,604251,8371731,87654321,111111111,1 %N A168647 Reverse (palindrome) of A164844. %F A168647 T(n,k) = A004086(A164844(n,k)). %e A168647 1 %e A168647 1,1 %e A168647 1,11,1 %e A168647 1,21,111,1 %e A168647 1,31,321,1111,1 %e A168647 1,41,631,4321,11111,1 %Y A168647 Cf. A004086, A164844. %K A168647 nonn,tabl,base %O A168647 0,5 %A A168647 _Mark Dols_, Dec 01 2009 %E A168647 a(24) onward corrected by _Georg Fischer_, Apr 08 2022