id:A123789 - 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 1x5 which is flat, i.e. with all blocks in parallel position and symmetric after a rotation by 180 degrees.

+0
1

1, 1, 5, 7, 49, 77, 572, 949, 7245, 12361, 96063 (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	`Sequence in context: A025530 A106114 A110420 this_sequence A082714 A106112 A108200` `Adjacent sequences: A123786 A123787 A123788 this_sequence A123790 A123791 A123792`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

AT&T Labs Research