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A025944
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Expansion of 1/((1-2x)(1-3x)(1-7x)(1-9x)).
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0
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1, 21, 292, 3414, 36439, 368607, 3604114, 34449888, 324158197, 3016246233, 27838148416, 255387389322, 2332396465075, 21228942680499, 192722119904398, 1746130572580116, 15796595736313873, 142739306095633005
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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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G.f.: 1/((1-2*x)*(1-3*x)*(1-7*x)*(1-9*x)).
a(n) = 3^(n+2)/8 -2^(n+3)/35 -7^(n+3)/40 +3^(2*n+5)/28. - R. J. Mathar, Jun 04 2013
a(n) = 21*a(n-1) - 149*a(n-2) + 411*a(n-3) - 378*a(n-4). - Wesley Ivan Hurt, Oct 29 2022
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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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