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1, 3, 9, 28, 91, 307, 1067, 3792, 13702, 50148, 185416, 691277, 2595167, 9800041, 37194707, 141787644, 542583488, 2083404030, 8024142706, 30988922366, 119972435149, 465505007827, 1809877343351, 7049866113619, 27507668129630
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Partial sums of number of fixed polyominoes with n cells, for n > 0.
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LINKS
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FORMULA
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EXAMPLE
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a(6) = 1 + 2 + 6 + 19 + 63 + 216 = 307.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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