id:A123832 - 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 3 X 3.

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1, 7, 227, 9130, 408081, 19274998, 946866202, 47865420384, 2473743947058 (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: A138247 A015506 A142606 this_sequence A093167 A142116 A081618` `Adjacent sequences: A123829 A123830 A123831 this_sequence A123833 A123834 A123835`
	KEYWORD	`nonn,hard`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.