id:A123834 - 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 3 X 3 which is symmetric after a rotation by 90 degrees.

+0
1

1, 1, 1, 1, 7, 10, 13, 50, 190, 292, 403, 1873, 6982 (list; graph; listen)

	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: A120153 A007770 A114961 this_sequence A064629 A059752 A080205` `Adjacent sequences: A123831 A123832 A123833 this_sequence A123835 A123836 A123837`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

AT&T Labs Research