id:A123773 - 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 and symmetric after a rotation by 180 degrees.

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1

1, 1, 3, 4, 16, 24, 103, 163, 721, 1173, 5283, 8783, 39912, 67381, 308314 (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	`Sequence in context: A042541 A047164 A108653 this_sequence A154736 A057542 A110983` `Adjacent sequences: A123770 A123771 A123772 this_sequence A123774 A123775 A123776`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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