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Search: id:A046979
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| A046979 |
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Denominators of Taylor series for exp(x)*sin(x). |
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+0
7
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| 1, 1, 1, 3, 1, 30, 90, 630, 1, 22680, 113400, 1247400, 1, 97297200, 681080400, 10216206000, 1, 1389404016000, 12504636144000, 237588086736000, 1, 49893498214560000, 548828480360160000, 12623055048283680000, 1, 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) = 1, a(n) = n!/2^[n/2].
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EXAMPLE
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1*x+1*x^2+1/3*x^3-1/30*x^5-1/90*x^6-1/630*x^7+1/22680*x^9+1/113400*x^10+...
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CROSSREFS
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Cf. A046978, A046981, A052277, A007019, A007452, A009775, A092820.
Absolute values are essentially the same as A007415.
Sequence in context: A027495 A138545 A120066 this_sequence A016481 A047815 A095844
Adjacent sequences: A046976 A046977 A046978 this_sequence A046980 A046981 A046982
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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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