A123829 - OEIS

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A123829

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2x4 which is symmetric after a rotation by 180 degrees.

1, 2, 44, 185, 3276, 15682, 282377, 1480410, 26264942 (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: A007367 A006313 A059737 * A035605 A203606 A009620` `Adjacent sequences: A123826 A123827 A123828 * A123830 A123831 A123832`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.