A123796 - OEIS

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A123796

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x6 which is flat, i.e. with all blocks in parallel position.

1, 6, 79, 1138, 18057, 296884, 5022086, 86581805, 1515222912 (list; graph; refs; listen; history; internal format)

	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: A053771 A093033 A156929 * A184553 A129524 A131237` `Adjacent sequences: A123793 A123794 A123795 * A123797 A123798 A123799`
	KEYWORD	`nonn,hard`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified February 14 18:47 EST 2012. Contains 205663 sequences.