A123840 - OEIS

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A123840

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 4 X 4 which is symmetric after a rotation by 90 degrees.

1, 1, 1, 1, 13, 19, 25, 165, 713 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,5`
	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: A121877 A109902 A058898 * A063640 A092104 A094105` `Adjacent sequences: A123837 A123838 A123839 * A123841 A123842 A123843`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified February 17 06:12 EST 2012. Contains 205990 sequences.