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A030445
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Number of one-sided n-celled polyknights.
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4
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1, 2, 8, 68, 550, 5328, 52484, 534793, 5513338, 57494308, 604212943
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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.
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EXAMPLE
| The two polyknights with 2 cells:
X.. ..X
..X X..
The 8 polyknights with 3 cells:
X. X.. X.. X... X.X .X. .X. X...
.. ... ..X .... ... X.. ..X ...X
.X .X. ... .X.. .X. ..X X.. .X..
.. ... .X. ...X
X. ..X
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CROSSREFS
| Cf. A030444, A030446, A030447, A030448.
Sequence in context: A202553 A023164 A053922 * A093990 A156448 A192550
Adjacent sequences: A030442 A030443 A030444 * A030446 A030447 A030448
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KEYWORD
| nonn,nice
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AUTHOR
| Dave Wilson
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EXTENSIONS
| Corrected and extended by Joseph S. Myers (jsm(AT)polyomino.org.uk), May 21, 2004
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