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A156122
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a(n) = P_{2n}(sqrt(2))/sqrt(2) (see A155100).
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2
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1, 6, 192, 15216, 2249472, 534437376, 186227300352, 89472023771136, 56685374949752832, 45789401925385322496, 45932606279820521766912, 56019030070478949980307456, 81629508898089483953705582592, 140066108036622450865749167702016, 279529326198310211796977967402319872
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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p[n_, u_]:= D[Tan[x], {x, n}] /. Tan[x] -> u /. Sec[x] -> Sqrt[1 + u^2] // Expand; p[-1, u_] = 1; Table[p[n, Sqrt[2]]/Sqrt[2], {n, -1, 100}][[2 ;; ;; 2]] (* G. C. Greubel, Sep 28 2018 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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