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Search: id:A128220
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| 1, 3, 2, 4, 4, 3, 5, 5, 5, 4, 6, 6, 6, 6, 5, 7, 7, 7, 7, 7, 6, 8, 8, 8, 8, 8, 8, 7, 9, 9, 9, 9, 9, 9, 9, 8, 10, 10, 10, 10, 10, 10, 10, 10, 9, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10
(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 = A028387: (1, 5, 11, 19, 29, 41, 55,...) A000012 * A127701 = A128219
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FORMULA
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A127701 * A000012 as infinite lower triangular matrices. Triangle read by rows: a(1) = 1; n-th row = (n-1)terms of (n+1) followed by "n".
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EXAMPLE
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First few rows of the triangle are:
1;
3, 2;
4, 4, 3;
5, 5, 5, 4;
6, 6, 6, 6, 5;
7, 7, 7, 7, 7, 6;
...
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CROSSREFS
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Cf. A128219, A000012, A127701, A028387.
Sequence in context: A010270 A023630 A110550 this_sequence A134749 A061901 A078822
Adjacent sequences: A128217 A128218 A128219 this_sequence A128221 A128222 A128223
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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), Feb 19 2007
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