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A067427
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Seventh column of triangle A067425.
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3
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1, 10, 280, 7840, 219520, 6146560, 172103680, 4818903040, 134929285120, 3778019983360, 105784559534080, 2961967666954240, 82935094674718720, 2322182650892124160, 65021114224979476480, 1820591198299425341440
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listen;
history;
text;
internal format)
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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) = 10*(4*7)^(n-1), n >= 1, a(0)=1.
G.f.: (1-18*x)/(1-28*x).
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PROG
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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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