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A081301
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Subdiagonal of square array A081297.
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6
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1, 1, 13, 41, 991, 5461, 194713, 1545265, 73022131, 758924981, 44709567013, 575279386969, 40614439994311, 623479972408021, 51316625644764721, 915589327332039905, 86090052046429522747, 1750836276286883890741
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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+2)^(n+1)-(-(n+1))^(n+1))/(2*n+3).
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MATHEMATICA
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Table[((n + 2)^(n + 1) - (-(n + 1))^(n + 1)) / (2 n + 3), {n, 0, 20}] (* Vincenzo Librandi, Aug 08 2013 *)
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PROG
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(Magma) [((n+2)^(n+1)-(-(n+1))^(n+1))/(2*n+3):n in [0..20]]; // Vincenzo Librandi, Aug 08 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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