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 A126757 #27 Nov 19 2021 17:41:05
%S A126757 1,1,1,2,4,8,18,47,137,464,1793,8167,43645,275480,2045279,17772647,
%T A126757 179593823,2098423758,28215583324,434936005284,7662164738118
%N A126757 Number of n-node connected graphs with no cycles of length less than 5.
%H A126757 Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial Graph Theory</a>
%H A126757 CombOS - Combinatorial Object Server, <a href="http://combos.org/nauty">Generate graphs</a>
%F A126757 This is the inverse Euler transform of A006787. - Conjectured by _Vladeta Jovovic_, Jun 16 2008, proved by _Max Alekseyev_ and _Brendan McKay_, Jun 17 2008
%t A126757 A006787 = Cases[Import["https://oeis.org/A006787/b006787.txt", "Table"], {_, _}][[All, 2]];
%t A126757 (* EulerInvTransform is defined in A022562 *)
%t A126757 EulerInvTransform[A006787] (* _Jean-François Alcover_, May 13 2019, updated Mar 17 2020 *)
%Y A126757 Cf. A006787, A140440.
%K A126757 nonn,more
%O A126757 1,4
%A A126757 _N. J. A. Sloane_, Feb 18 2007
%E A126757 Definition corrected by _Max Alekseyev_ and _Brendan McKay_, Jun 17 2008
%E A126757 a(20)-a(21) using _Brendan McKay_'s extension to A006787 by _Alois P. Heinz_, Mar 11 2018