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Search: id:A046981
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| A046981 |
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Denominators of Taylor series for exp(x)*cos(x). |
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13
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| 1, 1, 1, 3, 6, 30, 1, 630, 2520, 22680, 1, 1247400, 7484400, 97297200, 1, 10216206000, 81729648000, 1389404016000, 1, 237588086736000, 2375880867360000, 49893498214560000, 1, 12623055048283680000, 151476660579404160000, 3786916514485104000000
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OFFSET
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0,4
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REFERENCES
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G. W. Caunt, Infinitesimal Calculus, Oxford Univ. Press, 1914, p. 477.
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FORMULA
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a(4n+2) = 1, a(n) = n!/2^[n/2].
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EXAMPLE
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1+1*x-1/3*x^3-1/6*x^4-1/30*x^5+1/630*x^7+1/2520*x^8+1/22680*x^9-...
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CROSSREFS
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Cf. A046980, A046979, A052277, A007019, A007415, A009775, A092820.
Absolute values are essentially the same as A007452.
Sequence in context: A007228 A096155 A007452 this_sequence A065943 A025555 A136932
Adjacent sequences: A046978 A046979 A046980 this_sequence A046982 A046983 A046984
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KEYWORD
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nonn,frac,easy,nice
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AUTHOR
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njas
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