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Search: id:A128225
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| 1, 6, 2, 15, 9, 3, 28, 20, 12, 4, 45, 35, 25, 15, 5, 66, 54, 42, 30, 18, 6, 91, 77, 63, 49, 35, 21, 7, 120, 104, 88, 72, 56, 40, 24, 8, 153, 135, 117, 99, 81, 63, 45, 27, 9, 190, 170, 150, 130, 110, 90, 70, 50, 30, 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 = the cubes, A000578: (1, 8, 27, 64, 125,...). Left column = the hexagonal numbers: A000384: (1, 6, 15, 28,...). A128226 = A004736 * A127899.
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FORMULA
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A127899 (unsigned) * A004736, as infinite lower triangular matrices. Triangle read by rows: n*[(1); (3,1); (5,3,1);...]; Cf. A099375.
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EXAMPLE
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First few rows of the triangle are:
1;
6, 2;
15, 9, 3;
28, 20, 12, 4;
45, 35, 25, 15, 5;
66, 54, 42, 30, 18, 6;
91, 77, 63, 49, 35, 21, 7;
...
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CROSSREFS
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Cf. A127899, A004736, A000384, A000578, A128226, A099375.
Sequence in context: A116420 A069268 A082155 this_sequence A136398 A081778 A055943
Adjacent sequences: A128222 A128223 A128224 this_sequence A128226 A128227 A128228
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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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