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Search: id:A128228
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| 1, 2, 2, 3, 6, 3, 4, 8, 12, 4, 5, 10, 15, 20, 5, 6, 12, 18, 24, 30, 6, 7, 14, 21, 28, 35, 42, 7, 8, 16, 24, 32, 40, 48, 56, 8, 9, 18, 27, 36, 45, 54, 63, 72, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90, 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 = A006000: (1, 4, 12, 28, 55, 96, 154,...).
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FORMULA
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A128229 * A002260 as infinite lower triangular matrices. Triangle, n * (each term of A128227).
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EXAMPLE
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First few rows of the triangle are:
1;
2, 2;
3, 6, 3;
4, 8, 12, 4;
5, 10, 15, 20, 5;
6, 12, 18, 24, 30, 6;
7, 14, 21, 28, 35, 42, 7;
...
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CROSSREFS
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Cf. A128229, A002260, A006000, A128227.
Sequence in context: A015051 A064426 A051173 this_sequence A125102 A003506 A047662
Adjacent sequences: A128225 A128226 A128227 this_sequence A128229 A128230 A128231
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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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