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A127371
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Triangle read by rows: A051731 * A054521, as infinite lower triangular matrices.
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0
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1, 2, 0, 2, 1, 0, 3, 0, 1, 0, 2, 1, 1, 1, 0, 4, 1, 0, 0, 1, 0, 2, 1, 1, 1, 1, 1, 0, 4, 0, 2, 0, 1, 0, 1, 0, 3, 2, 0, 1, 1, 0, 1, 1, 0, 4, 1, 2, 1, 0, 0, 1, 0, 1, 0, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 6, 1, 1, 0, 2, 0, 1, 0, 0, 0, 1, 0
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OFFSET
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1,2
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COMMENTS
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Row sums = n, left column = d(n), (A000005: 1, 2, 2, 3, 2, 4, 2, ...).
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LINKS
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FORMULA
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Inverse Moebius transform of A054521.
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EXAMPLE
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First few rows of the triangle:
1;
2, 0;
2, 1, 0;
3, 0, 1, 0;
2, 1, 1, 1, 0;
4, 1, 0, 0, 1, 0;
2, 1, 1, 1, 1, 1, 0;
4, 0, 2, 0, 1, 0, 1, 0;
3, 2, 0, 1, 1, 0, 1, 1, 0;
...
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Definition clarified, a(56) corrected and more terms from Georg Fischer, May 29 2023
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STATUS
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approved
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