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Search: id:A131049
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| 1, 2, 2, 7, 6, 3, 20, 28, 12, 4, 61, 100, 70, 20, 5, 182, 366, 300, 140, 30, 6, 547, 1274, 1281, 700, 245, 42, 7, 1640, 4376, 5096, 3416, 1400, 392, 56, 8, 4921, 14760, 19692, 15288, 7686, 2520, 588, 72, 9
(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 = powers of 4: (1, 4, 16, 64,...). Left border = A015518: (1, 2, 7, 20, 61, 182,...).
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FORMULA
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(1/4) * (P^3 - 1/P), where P = Pascal's triangle, A007318. Delete right border of zeros.
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EXAMPLE
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First few rows of the triangle are:
1;
2, 2;
7, 6, 3;
20, 28, 12, 4;
61, 100, 70, 20, 5;
182, 366, 300, 140, 30, 6;
547, 1274, 1281, 700, 245, 42, 7;
...
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CROSSREFS
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Cf. A015518, A007318, A131047, A131048, A131050, A131051.
Sequence in context: A011146 A058625 A006748 this_sequence A126851 A064288 A054085
Adjacent sequences: A131046 A131047 A131048 this_sequence A131050 A131051 A131052
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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), Jun 12 2007
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