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 A262584 #13 Oct 19 2023 08:49:05 %S A262584 0,12,468,21399,1065228,55778796,3020636340,167544629316, %T A262584 9461343754980,541786421337804,31372013730812823,1833216802356228732, %U A262584 107939805322734748116,6396432908013911687436,381139174656828902370420 %N A262584 a(n) = (A002704(n) - 2)/2. %H A262584 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 A262584 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 A262584 Cf. A002704, A262570, A262583. %K A262584 nonn %O A262584 0,2 %A A262584 _N. J. A. Sloane_, Oct 20 2015 %E A262584 More terms from _R. J. Mathar_, Oct 21 2015