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%I #6 Aug 23 2018 05:12:26
%S 1,1,8,21,3040,20505,10567748,103372655
%N A condensed version of A108235.
%C Lists only the terms A108235(n) for n == 0 or 3 mod 12.
%C See A108235, the main entry for this sequence, for more information.
%H R. J. Nowakowski, <a href="/A104429/a104429.pdf">Generalizations of the Langford-Skolem problem</a>, M.S. Thesis, Dept. Math., Univ. Calgary, May 1975. [Scanned copy, with permission.]
%H Ana Rechtman, <a href="http://images.math.cnrs.fr/Aout-2018-3e-defi.html">Août 2018, 3e défi</a>, Images des Mathématiques, CNRS, 2018 (in French).
%Y Cf. A108235.
%K nonn,more
%O 1,3
%A _N. J. A. Sloane_, Apr 09 2017
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