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A067426
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Sixth column of triangle A067425.
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3
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1, 9, 216, 5184, 124416, 2985984, 71663616, 1719926784, 41278242816, 990677827584, 23776267862016, 570630428688384, 13695130288521216, 328683126924509184, 7888395046188220416, 189321481108517289984
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OFFSET
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0,2
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COMMENTS
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The fifth column of A067425 gives [1, 8, 160, 3200, 64000, 1280000, 25600000, ...].
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LINKS
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FORMULA
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a(n) = 9*(4*6)^(n-1), n >= 1, a(0)=1.
G.f.: (1-15*x)/(1-24*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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