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A123811 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x8 which is symmetric after a rotation by 180 degrees. 0

%I #5 Oct 09 2013 14:20:53

%S 1,1,73,893,11257,167129,1969619

%N Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x8 which is symmetric after a rotation by 180 degrees.

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

%K nonn

%O 1,3

%A _Søren Eilers_, Oct 29 2006

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)