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%I #10 Dec 10 2018 16:43:31
%S 1,1,5,81,4079,507549,127126912,55643064708,38715666455777,
%T 40095856807088486,58901884724160709571,118283825763578012358080,
%U 315297447553856723754810322,1089117884184737631305395668913,4778248300569771278502378511288513
%N Number of quad-coverings of a set.
%C Analogous to A165434. See comments and references there.
%Y Row 4 of A188392.
%Y Cf. A165434.
%K nonn
%O 0,3
%A _Doron Zeilberger_, Sep 18 2009
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