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A178616
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Triangle by columns, odd columns of Pascal's triangle A007318, otherwise (1, 0, 0, 0, ...).
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4
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1, 0, 1, 0, 2, 1, 0, 3, 0, 1, 0, 4, 0, 4, 1, 0, 5, 0, 10, 0, 1, 0, 6, 0, 20, 0, 6, 1, 0, 7, 0, 35, 0, 21, 0, 1, 0, 8, 0, 56, 0, 56, 0, 8, 0, 1, 0, 9, 0, 84, 0, 126, 0, 36, 0, 1, 0, 10, 0, 120, 0, 252, 0, 120, 0, 10, 1
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OFFSET
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0,5
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COMMENTS
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Row sums = a variant of A052950, starting (1, 1, 3, 4, 9, 16, 33, ...); whereas A052950 starts (2, 1, 3, 4, 9, ...).
Column 1 of the inverse of A178616 is a signed variant of A065619 prefaced with a 0; where A065619 = (1, 2, 3, 8, 25, 96, 427, ...).
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LINKS
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FORMULA
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Triangle, odd columns of Pascal's triangle; (1, 0, 0, 0, ...) as even columns k.
Alternatively, (since A178616 + A162169 - Identity matrix) = Pascal's triangle,
we can begin with Pascal's triangle, subtract A162169, then add the Identity
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EXAMPLE
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First few rows of the triangle:
1,
0, 1;
0, 2, 1;
0, 3, 0, 1
0, 4, 0, 4, 1;
0, 5, 0, 10, 0, 1;
0, 6, 0, 20, 0, 6, 1;
0, 7, 0, 35, 0, 21, 0, 1;
0, 8, 0, 56, 0, 56, 0, 8, 1;
0, 9, 0, 84, 0, 126, 0, 36, 0, 1;
0, 10, 0, 120, 0, 252, 0, 120, 0, 10, 1;
0, 11, 0, 165, 0, 462, 0, 330, 0, 55, 0, 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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