id:A123788 - 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 1x5 which is flat, i.e. with all blocks in parallel position.

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1, 5, 53, 623, 8075, 108463, 1499542, 21128897, 302219695, 4373563505 (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: A058390 A069592 A065534 this_sequence A036910 A036916 A118583` `Adjacent sequences: A123785 A123786 A123787 this_sequence A123789 A123790 A123791`
	KEYWORD	`nonn,hard`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified December 3 16:57 EST 2008. Contains 151279 sequences.

AT&T Labs Research