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A143620
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Triangle read by rows, square of A054521, 1<=k<=n.
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2
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1, 1, 0, 2, 0, 0, 2, 1, 0, 0, 4, 1, 1, 0, 0, 2, 1, 1, 1, 0, 0, 6, 2, 2, 1, 1, 0, 0, 4, 3, 2, 2, 1, 1, 0, 0, 6, 2, 4, 2, 2, 1, 1, 0, 0, 4, 3, 1, 2, 2, 1, 1, 1, 0, 0, 10, 4, 5, 3, 4, 1, 3, 1, 1, 0, 0, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 0, 0
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refs;
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history;
text;
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OFFSET
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1,4
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COMMENTS
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Left border = phi(n), A000010.
Row sums = A053570: (1, 1, 2, 3, 6, 5, 12, 13,...).
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LINKS
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Table of n, a(n) for n=1..78.
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FORMULA
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Triangle read by rows, square of A054521, 1<=k<=n
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EXAMPLE
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First few rows of the triangle =
1;
1, 0;
2, 0, 0;
2, 1, 0, 0;
4, 1, 1, 0, 0;
2, 1, 1, 1, 0, 0;
6, 2, 2, 1, 1, 0, 0;
4, 3, 2, 2, 1, 1, 0, 0;
6, 2, 4, 2, 2, 1, 1, 0, 0;
...
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CROSSREFS
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Cf. A054521, A000010, A053570.
Sequence in context: A238353 A238354 A161364 * A291529 A236417 A238304
Adjacent sequences: A143617 A143618 A143619 * A143621 A143622 A143623
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson, Aug 27 2008
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STATUS
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approved
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