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A167194
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Triangle read by rows. A130713 in the columns.
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3
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1, 2, 1, 1, 2, 1, 0, 1, 2, 1, 0, 0, 1, 2, 1, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 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,k) = binomial(2,n-k).
O.g.f.: (1+x)^2/(1-t*x).
Riordan array ((1+x)^2,x).
Matrix inverse is signed version of A004736. (End)
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EXAMPLE
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Table begins:
1,
2,1,
1,2,1,
0,1,2,1,
0,0,1,2,1,
0,0,0,1,2,1,
0,0,0,0,1,2,1,
0,0,0,0,0,1,2,1,
0,0,0,0,0,0,1,2,1,
0,0,0,0,0,0,0,1,2,1,
0,0,0,0,0,0,0,0,1,2,1,
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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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