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A030444 Number of fixed n-celled polyknights. 9
1, 4, 28, 234, 2162, 20972, 209608, 2135572, 22049959, 229939414, 2416816416, 25569786440 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A polyknight is a variant of a polyomino in which two tiles a knight's move apart are considered adjacent. A polyknight need not be connected in the sense of a polyomino.

REFERENCES

G. Aleksandrowicz and G. Barequet, Parallel enumeration of lattice animals, Proc. 5th Int. Frontiers of Algorithmics Workshop, Zhejiang, China, Lecture Notes in Computer Science, 6681, Springer-Verlag, 90-99, May 2011.

LINKS

Table of n, a(n) for n=1..12.

CROSSREFS

Cf. A030445, A030446, A030447, A030448.

Sequence in context: A229645 A202824 A046904 * A093877 A151830 A112113

Adjacent sequences:  A030441 A030442 A030443 * A030445 A030446 A030447

KEYWORD

nonn

AUTHOR

David W. Wilson

EXTENSIONS

Corrected and extended by Guenter Stertenbrink (Sterten(AT)aol.com), May 23, 2004

12th term by Gill Barequet, May 24 2011

STATUS

approved

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Last modified October 23 03:24 EDT 2014. Contains 248411 sequences.