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1, 1, 2, 3, 1, 3, 1, 4, 1, 4, 5, 1, 5, 1, 5, 1, 6, 1, 6, 1, 6, 7, 1, 7, 1, 7, 1, 8, 1, 8, 1, 8, 1, 8, 9, 1, 9, 1, 9, 1, 9, 1, 9, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10
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table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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COMMENTS
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Row sums = A128223: (1, 3, 7, 10, 17, 21, 31, 36,...).
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LINKS
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Table of n, a(n) for n=1..53.
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FORMULA
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A127701 * A128174 as infinite lower triangular matrices. Odd rows: n terms of n, 1, n...; even rows: n terms of 1, n, 1,...
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EXAMPLE
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First few rows of the triangle are:
1;
1, 2;
3, 1, 3;
1, 4, 1, 4;
5, 1, 5, 1, 5;
1, 6, 1, 6, 1, 6;
7, 1, 7, 1, 7, 1, 7;
...
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CROSSREFS
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Cf. A127701, A128174, A128223, A128222.
Sequence in context: A114899 A220906 A023678 * A057039 A135511 A007413
Adjacent sequences: A128219 A128220 A128221 * A128223 A128224 A128225
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson, Feb 19 2007
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STATUS
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approved
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