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A057424
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Diagonally symmetric (about diagonal 2) 2n-celled polyominoes with 1 hole.
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0
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1, 1, 5, 7, 21, 30, 88, 116, 336, 439, 1271, 1639, 4713, 6088, 17452
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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6,3
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COMMENTS
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The sequence refers to polyominoes with one hole and both diagonal symmetries but no other. - John Mason, Jan 16 2023
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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