id:A123763 - 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 1x2 which is symmetric after a rotation by 180 degrees.

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1, 1, 7, 11, 76, 135, 942, 1812, 12537, 25246, 174019, 362458, 2485725 (list; graph; listen)

	OFFSET	`1,3`
	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	`Adjacent sequences: A123760 A123761 A123762 this_sequence A123764 A123765 A123766` `Sequence in context: A085016 A067690 A061809 this_sequence A018680 A107187 A132958`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified October 12 12:19 EDT 2008. Contains 144830 sequences.

AT&T Labs Research