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Search: id:A132047
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| 1, 1, 1, 1, 6, 1, 1, 9, 9, 1, 1, 12, 18, 12, 1, 1, 15, 30, 30, 15, 1, 1, 18, 45, 60, 45, 18, 1, 1, 21, 63, 105, 105, 63, 21, 1, 1, 24, 84, 168, 210, 168, 84, 24, 1, 1, 27, 108, 252, 378, 378, 252, 108, 27, 1
(list; table; graph; listen)
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OFFSET
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0,5
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COMMENT
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Row sums = A131128: (1, 2, 8, 20, 44,...).
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FORMULA
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3*A007318 - 2*A103451 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
1, 1;
1, 6, 1;
1, 9, 9, 1;
1, 12, 18, 12, 1;
1, 15, 30, 30, 15, 1;
1, 28, 45, 60, 45, 18, 1;
...
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CROSSREFS
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Cf. A007318, A103451, A131128.
Adjacent sequences: A132044 A132045 A132046 this_sequence A132048 A132049 A132050
Sequence in context: A138072 A141600 A011491 this_sequence A140284 A046621 A046617
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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), Aug 08 2007
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