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Search: id:A128219
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| A128219 |
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A000012 * A127701. a(1) = 1, a(2) = 2, a(3) = 2; by rows, n-1 terms of 2, 3, 4...followed by "n". |
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2
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| 1, 2, 2, 2, 3, 3, 2, 3, 4, 4, 2, 3, 4, 5, 5, 2, 3, 4, 5, 6, 6, 2, 3, 4, 5, 6, 7, 7, 2, 3, 4, 5, 6, 7, 8, 8, 2, 3, 4, 5, 6, 7, 8, 9, 9, 2, 3, 4, 5, 6, 7, 8, 9, 10, 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 = A034856: (1, 4, 8, 13, 19, 26...). A128220 = A127701 * A000012
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FORMULA
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A000012 * A127701 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
2, 2;
2, 3, 3;
2, 3, 4, 4;
2, 3, 4, 5, 5;
2, 3, 4, 5, 6, 6;
2, 3, 4, 5, 6, 7, 7;
...
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CROSSREFS
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Cf. A000012, A127701, A034856.
Sequence in context: A059957 A094528 A077774 this_sequence A116505 A110534 A071451
Adjacent sequences: A128216 A128217 A128218 this_sequence A128220 A128221 A128222
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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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