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Search: id:A104728
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| 1, 9, 4, 30, 18, 7, 70, 48, 27, 10, 135, 100, 66, 36, 13, 231, 180, 130, 84, 45, 16, 364, 294, 225, 160, 102, 54, 19, 540, 448, 357, 270, 190, 120, 63, 22
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OFFSET
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1,2
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COMMENT
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Leftmost column (1, 9, 30, 70, 135...) = Octagonal pyramidal numbers, A002414. Row sums = A051798: 1, 13, 55, 155, 350, 686...(partial sums of A007586).
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FORMULA
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The triangle is extracted from A * B, A = [1; 1, 4; 1, 4, 7;...]; 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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The first few rows of the triangle are:
1;
9, 4;
30, 18, 7;
70, 48, 27, 10;
...
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CROSSREFS
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Cf. A051798, A007586, A002414.
Sequence in context: A061363 A100077 A014717 this_sequence A058093 A164032 A122846
Adjacent sequences: A104725 A104726 A104727 this_sequence A104729 A104730 A104731
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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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