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A027334
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a(n) = Sum_{k=0..m} (k+1) * A026148(n, m-k), where m=0 for n=1; m=n+1 for n >= 2.
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0
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1, 3, 18, 54, 162, 486, 1458, 4374, 13122, 39366, 118098, 354294, 1062882, 3188646, 9565938, 28697814, 86093442, 258280326, 774840978, 2324522934, 6973568802, 20920706406, 62762119218, 188286357654, 564859072962
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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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For n>1, a(n) = 2*3^n.
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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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