A123778 - OEIS

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A123778

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x4.

1, 12, 425, 17610, 818803, 40408828, 2078794759, 110210311068 (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: A098602 A000897 A036687 * A129006 A067429 A054913` `Adjacent sequences: A123775 A123776 A123777 * A123779 A123780 A123781`
	KEYWORD	`nonn,hard`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified February 15 23:34 EST 2012. Contains 205860 sequences.