id:A123819 - 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 2 X 2 which is symmetric after a rotation by 180 degrees.

+0
1

1, 1, 5, 8, 65, 126, 1023, 2187, 17585, 39606, 315326, 737302 (list; graph; listen)

	OFFSET	`1,3`
	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: A123816 A123817 A123818 this_sequence A123820 A123821 A123822` `Sequence in context: A117474 A068478 A132050 this_sequence A101016 A025518 A046490`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

AT&T Labs Research