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A054129
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T(n,3), array T as in A054126.
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0
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2, 9, 39, 134, 394, 1040, 2542, 5876, 13039, 28080, 59163, 122694, 251576, 511720, 1035068, 2085640, 4191629, 8409592, 16852833, 33748170, 67549470, 135164720, 270410170, 540918620, 1081955995, 2164054496
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OFFSET
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3,1
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LINKS
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FORMULA
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G.f.: x^3(-x^7+7x^6-21x^5+35x^4-35x^3+21x^2-7x+2)/[(1-2x)(1-x)^6].
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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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