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A158902
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Triangle read by rows: the matrix product A051731 * A158821.
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4
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1, 2, 1, 3, 0, 1, 5, 1, 0, 1, 5, 0, 0, 0, 1, 9, 1, 1, 0, 0, 1, 7, 0, 0, 0, 0, 0, 1, 12, 1, 0, 1, 0, 0, 0, 1, 11, 0, 1, 0, 0, 0, 0, 0, 1, 15, 1, 0, 0, 1, 0, 0, 0, 0, 1, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 23, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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FORMULA
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T(n,n) = 1.
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EXAMPLE
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First few rows of the triangle =
1;
2, 1;
3, 0, 1;
5, 1, 0, 1;
5, 0, 0, 0, 1;
9, 1, 1, 0, 0, 1;
7, 0, 0, 0, 0, 0, 1;
12, 1, 0, 1, 0, 0, 0, 1
11, 0, 1, 0, 0, 0, 0, 0, 1;
15, 1, 0, 0, 1, 0, 0, 0, 0, 1;
11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1;
23, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1;
13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1;
21, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1;
...
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MAPLE
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end proc:
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MATHEMATICA
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m = 12; (* number of rows *)
T1[n_, k_] := Boole[Mod[n, k] == 0];
T2[n_, k_] := Which[n == k, 1, k == 1, n-1, True, 0];
T = Array[T1, {m, m}].Array[T2, {m, m}];
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Wrong A-number in definition corrected by Robert Israel, Jan 08 2015
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STATUS
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approved
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