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A083083
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A diagonal of number array A083075.
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3
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1, 7, 97, 1831, 43393, 1242375, 41818561, 1620979687, 71191804801, 3496805826823, 190053352702753, 11329044782441127, 735151931535979777, 51600331868857972231, 3896042468112362132353, 314921475287825567805799
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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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a(n) = ((n+2)*(2n+7)^n + 1)/(n+3).
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MATHEMATICA
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Table[((n+2)(2n+7)^n+1)/(n+3), {n, 0, 20}] (* Harvey P. Dale, Nov 18 2021 *)
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PROG
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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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