A123786 - OEIS

%I #7 Feb 15 2025 15:26:27

%S 1,18,952,60878,4319328,325354277,25539764546,2066227060325

%N Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 5.

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

%K nonn,hard

%O 1,2

%A _Søren Eilers_, Oct 29 2006