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A062812
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a(n) = Sum_{i=1..n} i^(n - i) + (-1)^(n - i)*(n - i)^i.
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3
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1, 1, 5, 9, 25, 65, 205, 713, 2753, 11425, 50389, 234825, 1155817, 6009153, 32958173, 190115849, 1148816017, 7244099617, 47521750501, 323632894729, 2284774880441, 16702573959489, 126299702576365, 986688266888777
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OFFSET
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1,3
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LINKS
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MATHEMATICA
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Sum[i^(n - i) + (-1)^(n - i)*(n - i)^i, {i, 1, n}]
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PROG
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(PARI) a(n) = sum(i=1, n, i^(n-i) + (-1)^(n-i)*(n-i)^i); \\ Michel Marcus, Mar 24 2019
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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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