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A114283
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Sequence array for binomial transform of Jacobsthal numbers A001045(n+1).
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3
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1, 2, 1, 6, 2, 1, 18, 6, 2, 1, 54, 18, 6, 2, 1, 162, 54, 18, 6, 2, 1, 486, 162, 54, 18, 6, 2, 1, 1458, 486, 162, 54, 18, 6, 2, 1, 4374, 1458, 486, 162, 54, 18, 6, 2, 1, 13122, 4374, 1458, 486, 162, 54, 18, 6, 2, 1, 39366, 13122, 4374, 1458, 486, 162, 54, 18, 6, 2, 1
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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Riordan array ((1-x)/(1-3x), x).
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EXAMPLE
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Triangle begins
1;
2,1;
6,2,1;
18,6,2,1;
54,18,6,2,1;
162,54,18,6,2,1;
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PROG
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(Haskell)
a114283 n k = a114283_tabl !! n !! k
a114283_row n = a114283_tabl !! n
a114283_tabl = iterate
(\row -> (sum $ zipWith (+) row $ reverse row) : row) [1]
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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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