A123805 - OEIS

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A123805

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x7 which is flat, i.e. with all blocks in parallel position and symmetric after a rotation by 180 degrees.

1, 1, 7, 10, 100, 160, 1688, 2853, 30903, 53721 (list; graph; refs; listen; history; internal format)

	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: A115904 A136865 A123797 * A124200 A133346 A091920` `Adjacent sequences: A123802 A123803 A123804 * A123806 A123807 A123808`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified February 17 14:50 EST 2012. Contains 206050 sequences.