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A350551
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Convolution of Jacobsthal numbers and Pell numbers.
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0
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0, 0, 1, 3, 10, 28, 77, 203, 526, 1340, 3377, 8435, 20930, 51660, 126981, 311083, 760070, 1853068, 4509897, 10960243, 26605146, 64520060, 156344317, 378606795, 916354110, 2216907420, 5361353761, 12961984563, 31330062130, 75711587308, 182932193717
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OFFSET
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0,4
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COMMENTS
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a(n) is the convolution of the Jacobsthal numbers A001045 with the Pell numbers A000129. To be precise, a(n) = Sum_{i=0..n} A001045(i)*A000129(n-i).
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REFERENCES
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G. Dresden and M. Tulskikh, Convolutions of Sequences with Single-Term Signature Differences, preprint.
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LINKS
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FORMULA
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a(n) = Sum_{i=0..n} J(i)*P(n-i) for P(n) = A000129(n), J(n) = A001045(n).
a(n) = (P(n+1) + P(n) - J(n+2))/2 for P(n) = A000129(n), J(n) = A001045(n).
G.f.: x^2/(1 - 3*x - x^2 + 5*x^3 + 2*x^4).
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MATHEMATICA
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Table[Sum[((2^i - (-1)^i)/3) Fibonacci[n - i, 2], {i, 0, n}], {n, 0,
30}]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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