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0, 2, 130, 1588, 9780, 41030, 134342, 369640, 893928, 1956810, 3956810, 7499932, 13471900, 23125518, 38184590, 60965840, 94520272, 142795410, 210819858, 304911620, 432911620, 604443862, 831203670, 1127275448, 1509481400, 1997762650, 2615594202, 3390435180
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = n/21-n^3/3+n^5+n^6+(2*n^7)/7. - Colin Barker, Jun 28 2015
G.f.: 2*x*(x+1)*(x^4+56*x^3+246*x^2+56*x+1) / (x-1)^8. - Colin Barker, Jun 28 2015
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MATHEMATICA
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LinearRecurrence[{8, -28, 56, -70, 56, -28, 8, -1}, {0, 2, 130, 1588, 9780, 41030, 134342, 369640}, 30] (* Harvey P. Dale, Jul 18 2020 *)
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PROG
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(PARI) concat(0, Vec(2*x*(x+1)*(x^4+56*x^3+246*x^2+56*x+1)/(x-1)^8 + O(x^100))) \\ Colin Barker, Jun 28 2015
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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