id:A123787 - 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 1x5 which is symmetric after a rotation by 180 degrees.

+0
1

1, 2, 28, 192, 1680, 13644, 118916, 1044873, 9160772 (list; graph; listen)

	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: A006332 A065340 A001798 this_sequence A035601 A001759 A056261` `Adjacent sequences: A123784 A123785 A123786 this_sequence A123788 A123789 A123790`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research