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1, 3, 3, 5, 1, 5, 7, 1, 1, 7, 9, 1, 1, 1, 9, 11, 1, 1, 1, 1, 11, 13, 1, 1, 1, 1, 1, 13, 15, 1, 1, 1, 1, 1, 1, 15, 17, 1, 1, 1, 1, 1, 1, 1, 17, 19, 1, 1, 1, 1, 1, 1, 1, 1, 19, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 21, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 23, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 25, 27, 1, 1, 1, 1, 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 = 5*n + 1, A016861: (1, 6, 11, 16, 21,...).
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LINKS
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B. D. Swan, Table of n, a(n) for n=0,...,100000
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FORMULA
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2*A131821 - A000012 as an infinite lower triangular matrix. 2*n - 1, (1, 3, 5, 7,...) as right and left borders, with the rest zeros.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 3;
5, 1, 5;
7, 1, 1, 7;
9, 1, 1, 1, 9;
11, 1, 1, 1, 1, 11;
...
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CROSSREFS
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Cf. A131821, A016861.
Sequence in context: A011399 A205853 A079887 * A205550 A209389 A105104
Adjacent sequences: A131840 A131841 A131842 * A131844 A131845 A131846
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KEYWORD
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nonn,tabl,easy
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AUTHOR
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Gary W. Adamson, Jul 21 2007
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EXTENSIONS
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Corrected and edited by B. D. Swan (bdswan(AT)gmail.com), Dec 20 2008
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STATUS
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approved
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