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Search: id:A130270
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| A130270 |
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Triangle read by rows, T(n) followed by 1,2,3,...(n-1). |
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+0
1
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| 1, 3, 1, 6, 1, 2, 10, 1, 2, 3, 15, 1, 2, 3, 4, 21, 1, 2, 3, 4, 5, 28, 1, 2, 3, 4, 5, 6, 36, 1, 2, 3, 4, 5, 6, 7, 45, 1, 2, 3, 4, 5, 6, 7, 8
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Row sums = n^2.
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FORMULA
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Triangle read by rows, T(n) followed by 1,2,3,...(n-1). Row differences of triangle A130269 starting from the left.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 1;
6, 1, 2;
10, 1, 2, 3;
15, 1, 2, 3, 4;
...
Row 4 = (10, 1, 2, 3) = differences of row 4 of A130269: (10, 11, 13, 16).
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CROSSREFS
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Cf. A000217, A130269.
Sequence in context: A089732 A098076 A010287 this_sequence A090049 A115364 A016476
Adjacent sequences: A130267 A130268 A130269 this_sequence A130271 A130272 A130273
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), May 18 2007
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