id:A123764 - OEIS Search Results

Search: id:A123764

Displaying 1-1 of 1 results found.

page 1

Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x2 which is flat, i.e. with all blocks in parallel position.

+0
1

1, 2, 7, 24, 99, 416, 1854, 8407, 38970, 182742, 866442, 4140607, 19925401, 96430625, 469005432, 2290860538, 11232074043, 55255074216, 272634835875 (list; graph; listen)

	OFFSET	`1,2`
	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: A005754 A007162 A102286 this_sequence A013204 A013209 A048506` `Adjacent sequences: A123761 A123762 A123763 this_sequence A123765 A123766 A123767`
	KEYWORD	`nonn,hard`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

page 1

Search completed in 0.002 seconds

Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research