id:A123825 - 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 2x3 which is symmetric after a rotation by 180 degrees.

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1, 1, 25, 53, 1189, 2947, 66094, 181955, 3979943 (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: A118304 A117472 A146633 this_sequence A157269 A108166 A080863` `Adjacent sequences: A123822 A123823 A123824 this_sequence A123826 A123827 A123828`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.

AT&T Labs Research