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0, 0, 0, 144, 6000, 198000, 6420960, 218453760, 7988440320, 316674489600, 13630070361600, 635880851020800, 32050874586931200, 1738651147833600000, 101100246720625152000, 6277170099060596736000, 414620927349422137344000
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,4
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LINKS
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FORMULA
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a(n)=(2*n-1)!/(n-1)!-n!-sum(i=2, n, binomial(n-1, n-i)*n*n!)
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PROG
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(PARI) a(n)=(2*n-1)!/(n-1)!-n!-sum(i=2, n, binomial(n-1, n-i)*n*n!) for (i=2, 20, print1(a(i)", "))
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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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