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Search: id:A131108
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| 1, 1, 1, 2, 3, 1, 2, 6, 5, 1, 2, 8, 12, 7, 1, 2, 10, 20, 20, 9, 1, 2, 12, 30, 40, 30, 11, 1, 2, 14, 42, 70, 70, 42, 13, 1, 2, 16, 56, 112, 140, 112, 56, 15, 1, 15, 2, 18, 72, 168252, 252, 168, 72, 17, 1
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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Row sums = A095121: (1, 2, 6, 14, 30,...).
Triangle T(n,k), 0<=k<=n,read by rows given by [1,1,-2,1,0,0,0,0,0,0,0,...] DELTA [1,0,0,1,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A084938 . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Dec 18 2007
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FORMULA
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Twice Pascal's triangle minus A097806, the pairwise operator.
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EXAMPLE
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First few rows of the triangle are:
1;
1, 1;
2, 3, 1;
2, 6, 5, 1;
2, 8, 12, 7, 1;
2, 10, 20, 20, 9, 1;
...
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CROSSREFS
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Cf. A097806, A095121, A007318.
Sequence in context: A023986 A109202 A117488 this_sequence A128255 A109091 A138507
Adjacent sequences: A131105 A131106 A131107 this_sequence A131109 A131110 A131111
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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 15 2007
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EXTENSIONS
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Corrected by Philippe DELEHAM, Dec 17 2007
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