A123846 - OEIS

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A123846

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 5x5 which is symmetric after a rotation by 90 degrees.

1, 1, 1, 1, 21, 31, 41, 421, 1937 (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: A079394 A112375 A067599 * A168000 A031889 A034101` `Adjacent sequences: A123843 A123844 A123845 * A123847 A123848 A123849`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified February 17 13:02 EST 2012. Contains 206021 sequences.