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Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2x4 which is symmetric after a rotation by 180 degrees.
64

%I #7 May 31 2016 14:53:47

%S 1,2,44,185,3276,15682,282377,1480410,26264942

%N Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2x4 which is symmetric after a rotation by 180 degrees.

%H <a href="/wiki/Index_to_OEIS:_Section_Lc#LEGO">Index entry for sequences related to LEGO blocks</a>

%Y Cf. A112389, A123762 - A123827, A123829 - A123849.

%K nonn

%O 1,2

%A _Søren Eilers_, Oct 29 2006