A123789 - cp's OEIS frontend

A123789 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 5 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.

%I A123789 #12 Sep 12 2018 05:30:20
%S A123789 1,1,5,7,49,77,572,949,7245,12361,96063,167564,1313467,2327488,
%T A123789 18365795,32936281,261111133,472694546
%N A123789 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 5 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.
%Y A123789 Cf. A112389, A123762 - A123827, A123829 - A123849.
%K A123789 nonn,more
%O A123789 1,3
%A A123789 _Søren Eilers_, Oct 29 2006
%E A123789 More terms by _Søren Eilers_, Sep 12 2018

cp's OEIS Frontend

A123789 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 5 which is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.