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Search: id:A104727
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| 1, 7, 3, 25, 15, 6, 65, 45, 26, 10, 140, 105, 71, 40, 15, 266, 210, 155, 103, 57, 21, 462, 378, 295, 215, 141, 77, 28
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OFFSET
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1,2
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COMMENT
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Leftmost column (1, 7, 25, 65, 140...= A001296, 4-D pryamidal numbers). Row sums = 1, 10, 46, 146, 371...(A024166) B * A generates triangle A098358.
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FORMULA
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Triangle is extracted from A * B, A = [1; 1, 3; 1, 3, 6;...]; B = [1; 2, 1; 3, 2, 1;...] both infinite lower triangular matrices with the rest of the terms zeros.
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EXAMPLE
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First few rows of the triangle are:
1;
7, 3;
25, 15, 6;
665, 45, 26, 10;
140, 105, 71, 40, 15;
266, 210, 155, 103, 57, 21;
...
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CROSSREFS
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Cf. A098358, A104727, A024166.
Sequence in context: A098231 A104716 A002969 this_sequence A116419 A099398 A038269
Adjacent sequences: A104724 A104725 A104726 this_sequence A104728 A104729 A104730
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KEYWORD
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nonn,uned,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Mar 20 2005
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