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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
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

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.

Sequence in context: A121220 A068091 A001207 * A026887 A151106 A302186

Adjacent sequences:  A319153 A319154 A319155 * A319157 A319158 A319159

KEYWORD

nonn

AUTHOR

Søren Eilers, Sep 12 2018

STATUS

approved

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Last modified May 17 17:25 EDT 2021. Contains 343983 sequences. (Running on oeis4.)