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A279917
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a(n) = Sum_{k=1..n-1} sigma_5(k)*sigma_7(n-k).
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3
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0, 1, 162, 6689, 121250, 1296406, 9613604, 54550049, 252178758, 992204376, 3424910566, 10615778966, 30047257318, 78751366604, 193075366412, 446840757793, 982597838280, 2066025009763, 4171924730922, 8127978871064, 15324653827568, 28059983210370
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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FORMULA
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a(n) = (sigma_13(n)+20*sigma_7(n)-21*sigma_5(n))/10080.
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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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