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Search: id:A131843
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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, 1, 15
(list; table; graph; listen)
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OFFSET
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0,2
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COMMENT
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Row sums = 5*n + 1, A016861: (1, 6, 11, 16, 21,...).
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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.
Adjacent sequences: A131840 A131841 A131842 this_sequence A131844 A131845 A131846
Sequence in context: A109824 A011399 A079887 this_sequence A105104 A101777 A016555
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KEYWORD
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nonn,tabl,easy,more
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 21 2007
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