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 A262570 #19 Oct 20 2023 09:51:23 %S A262570 1,13,469,21400,1065229,55778797,3020636341,167544629317, %T A262570 9461343754981,541786421337805,31372013730812824,1833216802356228733, %U A262570 107939805322734748117,6396432908013911687437,381139174656828902370421,22819171231066917509661277 %N A262570 a(n) = A002704(n)/2. %H A262570 Alexander Rosa and Štefan Znám, <a href="/A002703/a002703.pdf">A combinatorial problem in the theory of congruences (Russian with English summary)</a>, Mat.-Fys. Casopis Sloven. Akad. Vied 15 1965 49-59. [Annotated scanned copy.] %H A262570 Alexander Rosa and Štefan Znám, <a href="/A002703/a002703_1.pdf">A remark on a combinatorial problem (Russian with English summary)</a>, Mat.-Fyz. Casopis Sloven. Akad. Vied 15 1965 313-316. [Annotated scanned copy] See Table 3. %Y A262570 Cf. A002704, A262583, A262584. %K A262570 nonn %O A262570 0,2 %A A262570 _N. J. A. Sloane_, Oct 20 2015 %E A262570 More terms from _R. J. Mathar_, Oct 21 2015