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A216954
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Triangle read by rows: A216953/2.
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2
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1, 1, 1, 1, 0, 3, 1, 1, 0, 6, 1, 0, 0, 0, 15, 1, 1, 3, 0, 0, 27, 1, 0, 0, 0, 0, 0, 63, 1, 1, 0, 6, 0, 0, 0, 120, 1, 0, 3, 0, 0, 0, 0, 0, 252, 1, 1, 0, 0, 15, 0, 0, 0, 0, 495, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1023, 1, 1, 3, 6, 0, 27, 0, 0, 0, 0, 0, 2010, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4095, 1, 1, 0, 0, 0, 0, 63, 0, 0, 0, 0, 0, 0, 8127
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,6
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LINKS
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EXAMPLE
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Triangle begins:
1;
1, 1;
1, 0, 3;
1, 1, 0, 6;
1, 0, 0, 0, 15;
1, 1, 3, 0, 0, 27;
1, 0, 0, 0, 0, 0, 63;
1, 1, 0, 6, 0, 0, 0, 120;
1, 0, 3, 0, 0, 0, 0, 0, 252;
1, 1, 0, 0, 15, 0, 0, 0, 0, 495;
...
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MATHEMATICA
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a027375[n_] := DivisorSum[n, MoebiusMu[n/#] 2^# &];
T[n_, k_] := If[Divisible[n, k], a027375[k]/2, 0];
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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