A319156 Number of ways to build a contiguous building with n LEGO blocks of size 1 X 2 which is flat, i.e., with all blocks in parallel position.

1, 3, 11, 44, 186, 814, 3656, 16731, 77705, 365095, 1731797, 8279363, 39845689, 192852359, 937986507, 4581678031, 22464030959, 110509938701, 545269104263, 2697646445713, 13378627003520, 66495716465315, 331167284581601, 1652340114446553, 8258197397705302

Offset: 1

Author

Søren Eilers, Sep 12 2018

Keywords

• nonn

Links

• Rasmus Mølck Nilsson: On the number of flat LEGO structures, Master's thesis in Mathematics, University of Copenhagen, 2016.

Crossrefs

Cf. A123764, but here no identification up to rotation is performed.