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%I #20 Oct 20 2023 09:48:42
%S 0,0,0,1,3,7,12,23,44,81,150,281,528,991,1871,3541,6719,12787,24384,
%T 46599,89240,171196,328959,633101,1220159,2354687,4549752,8801161,
%U 17043505,33038207,64103988,124491775,241969988,470681347,916259631,1784921473,3479467176,6787108712,13247128044,25870861823
%N a(n) = A002703(n)/2.
%C A002703 is somewhat mysterious. Having four versions (A002703, this sequence, A262568, A262569) instead of one increases the chance that one of them will be found in a different context.
%H Alexander Rosa and Štefan Znám, <a href="/A002703/a002703.pdf">A combinatorial problem in the theory of congruences. (Russian)</a>, Mat.-Fys. Casopis Sloven. Akad. Vied 15 1965 49-59. [Annotated scanned copy]
%p See A262568.
%Y Cf. A002703, A262568, A262569.
%Y Tables 1 and 2 of the first Rosa-Znám 1965 paper are A053632 and A178666 respectively.
%K nonn
%O 3,5
%A _N. J. A. Sloane_, Oct 20 2015
%E More terms from _R. J. Mathar_, Oct 21 2015