id:A123795 - 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 1x6 which is symmetric after a rotation by 180 degrees.

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1

1, 1, 43, 289, 3796, 30757, 384465, 3363194 (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: A142450 A142632 A140012 this_sequence A164783 A142502 A142770` `Adjacent sequences: A123792 A123793 A123794 this_sequence A123796 A123797 A123798`
	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.

AT&T Labs Research