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Search: id:A131050
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| 1, 3, 2, 13, 9, 3, 51, 52, 18, 4, 205, 255, 130, 30, 5, 819, 1230, 765, 260, 45, 6, 3277, 5733, 4305, 1785, 455, 63, 7, 13107, 26216, 22932, 11480, 3570, 728, 84, 8
(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 5: (1, 5, 25, 125,...). Left border = A015521: (1, 3, 13, 51, 205, 819,...).
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FORMULA
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Let P = Pascal's triangle, A007318. Then A131050 = (1/5) * (P^4 - 1/P); deleting the right border of zeros.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 2;
13, 9, 3;
51, 52, 18, 4;
205, 255, 130, 30, 5;
...
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CROSSREFS
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Cf. A015521, A131047, A131048, A131049, A131051.
Sequence in context: A075555 A075556 A087357 this_sequence A084416 A005352 A095131
Adjacent sequences: A131047 A131048 A131049 this_sequence A131051 A131052 A131053
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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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