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