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A011948
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Number of Barlow packings with group P63mc that repeat after 2n layers.
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3
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1, 1, 4, 7, 18, 31, 70, 126, 261, 484, 960, 1800, 3514, 6643, 12852, 24457, 47151, 90157, 173740, 333498, 643230, 1238664, 2392650, 4620006, 8939657, 17302033, 33538048, 65042495, 126289800, 245361171, 477153040, 928510506, 1808276211, 3523813566, 6871685532, 13408154100, 26178323928, 51139027135
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listen;
history;
text;
internal format)
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OFFSET
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6,3
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LINKS
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CROSSREFS
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Appears to be column k=2 of A309784.
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KEYWORD
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nonn,changed
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AUTHOR
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STATUS
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approved
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