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A081298
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Main diagonal of the square array A081297.
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6
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1, 1, 7, 25, 461, 2821, 84883, 734161, 30684601, 342800821, 18348174791, 251203133545, 16394732478853, 265727053328101, 20464206411678331, 383172119935376161, 34011762638354230001, 722380674949394645269
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = ((n+1)^(n+1)-(-n)^(n+1))/(2n+1).
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MATHEMATICA
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Table[((n + 1)^(n + 1) - (-n)^(n + 1)) / (2 n + 1), {n, 0, 20}] (* Vincenzo Librandi, Aug 07 2013 *)
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PROG
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(Magma) [((n+1)^(n+1)-(-n)^(n+1))/(2*n+1): n in [0..20]]; // Vincenzo Librandi, Aug 07 2013
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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