id:A123839 - OEIS Search Results

Search: id:A123839

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 4 X 4 which is symmetric after a rotation by 180 degrees.

+0
1

1, 1, 21, 67, 1565, 6241, 137613, 630193, 13136926 (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: A020309 A048713 A123779 this_sequence A043339 A023712 A045124` `Adjacent sequences: A123836 A123837 A123838 this_sequence A123840 A123841 A123842`
	KEYWORD	`nonn`
	AUTHOR	`Soren Eilers (eilers(AT)math.ku.dk), Oct 29 2006`

page 1

Search completed in 0.002 seconds

Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

AT&T Labs Research