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A117317
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Triangle related to partitions of n.
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7
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1, 2, 1, 4, 5, 1, 8, 16, 9, 1, 16, 44, 41, 14, 1, 32, 112, 146, 85, 20, 1, 64, 272, 456, 377, 155, 27, 1, 128, 640, 1312, 1408, 833, 259, 35, 1, 256, 1472, 3568, 4712, 3649, 1652, 406, 44, 1, 512, 3328, 9312, 14608, 14002, 8361, 3024, 606, 54, 1, 1024, 7424, 23552
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listen;
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OFFSET
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0,2
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COMMENTS
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Essentially given by (0, 2, 0, 0, 0, 0, 0, 0, 0, ...) DELTA (1, 0, 1/2, 1/2, 0, 0, 0, 0, 0, 0, 0, ...) where DELTA is the operator defined in A084938. - Philippe Deléham, Jan 28 2012
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LINKS
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FORMULA
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Number triangle T(n,k)=sum{j=0..n-k, C(n+j,k)C(n-k,j)}
T(n,k) = 2*T(n-1,k) + 2*T(n-1,k-1) - T(n-2,k-1) - T(n-2,k-2) for n>1. - Philippe Deléham, Jan 28 2012
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EXAMPLE
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Triangle begins
1,
2, 1,
4, 5, 1,
8, 16, 9, 1,
16, 44, 41, 14, 1,
32, 112, 146, 85, 20, 1,
64, 272, 456, 377, 155, 27, 1
Triangle (0, 2, 0, 0, 0, 0, ...) DELTA (1, 0, 1/2, 1/2, 0, 0, ...) begins :
1
0, 1
0, 2, 1
0, 4, 5, 1
0, 8, 16, 9, 1
0, 16, 44, 41, 14, 1
0, 32, 112, 146, 85, 20, 1
0, 64, 272, 456, 377, 155, 27, 1
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PROG
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(Haskell)
a117317 n k = a117317_tabl !! n !! k
a117317_row n = a117317_tabl !! n
a117317_tabl = map reverse a056242_tabl
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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