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Search: id:A046990
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| A046990 |
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Numerators of Taylor series for log(1/cos(x)). Also from log(cos(x)). |
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+0
9
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| 0, 1, 1, 1, 17, 31, 691, 10922, 929569, 3202291, 221930581, 9444233042, 56963745931, 29435334228302, 2093660879252671, 344502690252804724, 129848163681107301953, 868320396104950823611, 209390615747646519456961, 28259319101491102261334882
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OFFSET
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0,5
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REFERENCES
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CRC Standard Mathematical Tables and Formulae, 30th ed. 1996, p. 42.
L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 88.
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LINKS
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T. D. Noe, Table of n, a(n) for n=0..100
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EXAMPLE
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log(1/cos(x)) = 1/2*x^2+1/12*x^4+1/45*x^6+17/2520*x^8+31/14175*x^10+...
log(cos(x)) = -(1/2*x^2+1/12*x^4+1/45*x^6+17/2520*x^8+31/14175*x^10+...).
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CROSSREFS
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Cf. A046991.
Cf. A002430, A050970.
Sequence in context: A146462 A089171 A002425 this_sequence A059212 A058899 A038354
Adjacent sequences: A046987 A046988 A046989 this_sequence A046991 A046992 A046993
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KEYWORD
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nonn,easy,frac,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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