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Search: id:A143595
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| A143595 |
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Triangle read by rows, A000012 * (an infinite lower triangular matrix with 1's in the first column and the rest 2's); 1<=k<=n. |
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+0
3
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| 1, 2, 2, 3, 4, 2, 4, 6, 4, 2, 5, 8, 6, 4, 2, 6, 10, 8, 6, 4, 2, 7, 12, 10, 8, 6, 4, 2, 8, 14, 12, 10, 8, 6, 4, 2, 9, 16, 14, 12, 10, 8, 6, 4, 2, 10, 18, 16, 14, 12, 10, 8, 6, 4, 2, 11, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2
(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.
The linear sequence A056944 is more appropriately a triangle, (reversal of A143595).
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FORMULA
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Triangle read by rows, A000012 * (an infinite lower triangular matrix with 1's in the first column and the rest 2's); i.e. (1; 1,2; 1,2,2;...). A000012 = an infinite lower triangular matrix with all 1's. 1<=k<=n
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EXAMPLE
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First few rows of the triangle =
1;
2, 2;
3, 4, 2;
4, 6, 4, 2;
5, 8, 6, 4, 2;
6, 10, 8, 6, 4, 2;
7, 12, 10, 8, 6, 4, 2;
...
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CROSSREFS
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Cf. A056944.
Sequence in context: A159978 A098223 A114892 this_sequence A077769 A144909 A117114
Adjacent sequences: A143592 A143593 A143594 this_sequence A143596 A143597 A143598
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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), Aug 26 2008
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