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A353911
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Product_{n>=1} 1 / (1 - a(n)*x^n/n!) = 1 + tan(x).
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6
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1, -2, 2, -32, 56, -416, 3184, -85504, 309760, -4087552, 48104704, -546922496, 10591523840, -194387924992, 3133776259072, -129880886411264, 1249919350046720, -29073986250604544, 624022403933077504, -15137719350365519872, 381632216575339397120, -11149155036737662615552
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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nn = 22; f[x_] := Product[1/(1 - a[n] x^n/n!), {n, 1, nn}]; sol = SolveAlways[0 == Series[f[x] - 1 - Tan[x], {x, 0, 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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