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(PARI) \\ See Links section.
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a(n) = (75*n - 9*A163805(n+2) + 6*A049347(n+2))/18 for n > 0. - Stefano Spezia, Jun 08 2024
nonn,easy
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<a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (1, -1, 2, -1, 1, -1).
LinearRecurrence[{1, -1, 2, -1, 1, -1}, {1, 4, 8, 13, 17, 20, 25}, 100] (* Paolo Xausa, Nov 15 2023 *)
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