id:A123780 - 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 1x4 which is flat, i.e. with all blocks in parallel position.

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1, 4, 33, 294, 2951, 30668, 328999, 3596934, 39932206, 448517488, 5086259884, 58135266335 (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	`Adjacent sequences: A123777 A123778 A123779 this_sequence A123781 A123782 A123783` `Sequence in context: A081007 A088317 A041024 this_sequence A054371 A028576 A093185`
	KEYWORD	`nonn,hard`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

AT&T Labs Research