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 A341943 #7 Feb 27 2021 11:18:57 %S A341943 0,1,6,11,54,91,438,731,3510,5851,28086,46811,224694,374491,1797558, %T A341943 2995931,14380470,23967451,115043766,191739611,920350134,1533916891 %N A341943 Fixed points of A341915. %F A341943 Apparently: %F A341943 - a(1) = 1, %F A341943 - a(2) = 6, %F A341943 - a(2*k+1) = 8*a(2*k-1) + 3 for any k > 0, %F A341943 - a(2*k+2) = 8*a(2*k) + 6 for any k > 0. %e A341943 A341915(6) = 6, so 6 belongs to this sequence. %e A341943 A341915(7) = 4, so 7 does not belong to this sequence. %Y A341943 Cf. A341915, A341916. %K A341943 nonn,base,more %O A341943 1,3 %A A341943 _Rémy Sigrist_, Feb 24 2021