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A166453
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Triangle read by rows, square of Sierpinski's gasket, (A047999)^2
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1
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1, 2, 1, 2, 0, 1, 4, 2, 2, 1, 2, 0, 0, 0, 1, 4, 2, 0, 0, 2, 1, 4, 0, 2, 0, 2, 0, 1, 8, 4, 4, 2, 4, 2, 2, 1, 2, 0, 0, 0, 0, 0, 0, 0, 1, 4, 2, 0, 0, 0, 0, 0, 0, 2, 1, 4, 0, 2, 0, 0, 0, 0, 0, 2, 0, 1
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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Row sums = A048883: (1, 3, 3, 9, 3, 9, 9, 27, 3, 9, 9, 27,...)
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LINKS
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FORMULA
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(A047999)^2, as an infinite lower triangular matrix.
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EXAMPLE
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First few rows of the triangle =
1;
2, 1;
2, 0, 1;
4, 2, 2, 1;
2, 0, 0, 0, 1;
4, 2, 0, 0, 2, 1;
4, 0, 2, 0, 2, 0, 1;
8, 4, 4, 2, 4, 2, 2, 1;
2, 0, 0, 0, 0, 0, 0, 0, 1;
4, 2, 0, 0, 0, 0, 0, 0, 2, 1;
4, 0, 2, 0, 0, 0, 0, 0, 2, 0, 1;
8, 4, 4, 2, 0, 0, 0, 0, 4, 2, 2, 1;
4, 0, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 1;
...
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MATHEMATICA
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rows = 11;
T = PadRight[#, rows]& /@ Mod[NestList[Prepend[#, 0] + Append[#, 0]&, {1}, rows-1], 2];
T2 = T.T;
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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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