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A067967
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Number of binary arrangements without adjacent 1's on n X n hexagonal staggered torus shifted for odd n.
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1
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1, 5, 19, 217, 4076, 164258, 12285477, 1834600977, 527717587843, 296979228487760, 324881629286870822, 692625866382651263578
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 342-349.
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LINKS
| S. R. Finch, Hard Square Entropy Constant
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EXAMPLE
| Neighbors for n=4:
:\|/ | \|/ |
:-o--o--o--o-
: | /|\ | /|\
:\|/ | \|/ |
:-o--o--o--o-
: | /|\ | /|\
:\|/ | \|/ |
:-o--o--o--o-
: | /|\ | /|\
:\|/ | \|/ |
:-o--o--o--o-
: | /|\ | /|\
Neighbors for n=5:
:\|/ | \|/ | \|
:-o--o--o--o--o-
: | /|\ | /|\ |\
:\|/ | \|/ | \|
:-o--o--o--o--o-
: | /|\ | /|\ |\
:\|/ | \|/ | \|
:-o--o--o--o--o-
: | /|\ | /|\ |\
:\|/ | \|/ | \|
:-o--o--o--o--o-
: | /|\ | /|\ |\
:\|/ | \|/ | \|
:-o--o--o--o--o-
: | /|\ | /|\ |\
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CROSSREFS
| For bent instead of shifted for odd n see A066865.
Sequence in context: A123281 A135171 A058765 * A092751 A122150 A092663
Adjacent sequences: A067964 A067965 A067966 * A067968 A067969 A067970
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KEYWORD
| nonn
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Feb 02 2002
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