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A067967 Number of binary arrangements without adjacent 1's on n X n hexagonal staggered torus shifted for odd n. 1
1, 5, 19, 217, 4076, 164258, 12285477, 1834600977, 527717587843, 296979228487760, 324881629286870822, 692625866382651263578, 2874716493700380888930840, 23237986479606982160703729647, 365788614113216462103977935612524, 11213018647250714014261414954480048385 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
REFERENCES
Steven R. Finch, Mathematical Constants, Cambridge, 2003, pp. 342-349.
LINKS
Steven R. Finch, Hard Square Entropy Constant [Broken link]
Steven R. Finch, Hard Square Entropy Constant [From the Wayback machine]
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-
: | /|\ | /|\ |\
CROSSREFS
For bent instead of shifted for odd n see A066865.
Sequence in context: A058765 A317340 A328716 * A362281 A092751 A357363
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 02 2002
EXTENSIONS
More terms from Sean A. Irvine, Nov 18 2023
STATUS
approved

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Last modified March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)