id:A123772 - OEIS Search Results

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Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x3 which is flat, i.e. with all blocks in parallel position.

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1, 3, 17, 107, 761, 5607, 42730, 331851, 2618024, 20895964, 168398683, 1367838390, 11184711448, 91976811135 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`M. Abrahamsen and S. Eilers, Efficient counting of LEGO buildings, in preparation` `B. Durhuus and S. Eilers, On the entropy of LEGO, arXiv:math.CO/0504039`
	LINKS	`S. Eilers, LEGO counts`
	CROSSREFS	`Sequence in context: A162479 A074563 A077145 this_sequence A103730 A074556 A119259` `Adjacent sequences: A123769 A123770 A123771 this_sequence A123773 A123774 A123775`
	KEYWORD	`nonn,hard`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research