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A353609
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Product_{n>=1} (1 + a(n)*x^(2*n)/(2*n)!) = cosh(x).
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7
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1, 1, -14, 393, -14744, 972610, -74928944, 9322093753, -1163849271296, 228519734620776, -44942000161435904, 12717856972091286642, -3539995034294896016384, 1371560847857743301790928, -510461123036204706738612224, 268938575250382935485761673113
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OFFSET
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1,3
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LINKS
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MATHEMATICA
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nn = 16; f[x_] := Product[(1 + a[n] x^(2 n)/(2 n)!), {n, 1, nn}]; sol = SolveAlways[0 == Series[f[x] - Cosh[x], {x, 0, 2 nn}], x]; Table[a[n], {n, 1, nn}] /. sol // Flatten
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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