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%I #8 Aug 04 2018 06:39:10
%S 1,2,52,617,6052,86534,814679,12560687
%N Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x7 which is symmetric after a rotation by 180 degrees.
%Y Cf. A112389, A123762 - A123827, A123829 - A123849.
%K nonn,more
%O 1,2
%A _Søren Eilers_, Oct 29 2006
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