Search: id:A046990
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%I A046990
%S A046990 0,1,1,1,17,31,691,10922,929569,3202291,221930581,9444233042,56963745931,
%T A046990 29435334228302,2093660879252671,344502690252804724,129848163681107301953,
%U A046990 868320396104950823611,209390615747646519456961,28259319101491102261334882
%N A046990 Numerators of Taylor series for log(1/cos(x)). Also from log(cos(x)).
%D A046990 CRC Standard Mathematical Tables and Formulae, 30th ed. 1996, p. 42.
%D A046990 L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 88.
%H A046990 T. D. Noe, <a href="b046990.txt">Table of n, a(n) for n=0..100</a>
%e A046990 log(1/cos(x)) = 1/2*x^2+1/12*x^4+1/45*x^6+17/2520*x^8+31/14175*x^10+...
%e A046990 log(cos(x)) = -(1/2*x^2+1/12*x^4+1/45*x^6+17/2520*x^8+31/14175*x^10+...).
%Y A046990 Cf. A046991.
%Y A046990 Cf. A002430, A050970.
%Y A046990 Sequence in context: A146462 A089171 A002425 this_sequence A059212 A058899 
               A038354
%Y A046990 Adjacent sequences: A046987 A046988 A046989 this_sequence A046991 A046992 
               A046993
%K A046990 nonn,easy,frac,nice
%O A046990 0,5
%A A046990 N. J. A. Sloane (njas(AT)research.att.com).

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