%I A000061 M0938 N0352
%S A000061 1,1,2,4,4,6,8,8,12,14,14,16,20,20,24,32,24,30,38,32,40,46,40,48,60,50,
%T A000061 54,64,60,68,80,64,72,92,76,96,100,82,104,112,96,108,126,112,120,148,
%U A000061 112,128,168,130,156,160,140,162,184,160,168,198,170,192,220,168,192
%N A000061 Generalized tangent numbers.
%C A000061 Comment from David W. Wilson, May 26 2007: If you look at the MathWorld 
               article on Tangent Numbers, this sequence seems to give the initial 
               terms of the sequences given in the table at the bottom of the article, 
               which, in the nomenclature of the article, would translate to a(n) 
               = d(n, 1) where d(a,n) is defined in equation (4), taken from the 
               Shanks reference.
%D A000061 Knuth, D. E.; Buckholtz, Thomas J. Computation of tangent, Euler and 
               Bernoulli numbers. Math. Comp. 21 1967 663-688.
%D A000061 D. Shanks, Generalized Euler and class numbers, Math. Comp. 21 (1967), 
               689-694; 22 (1968), 699.
%D A000061 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A000061 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A000061 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               TangentNumber.html">Tangent Number</a>
%Y A000061 Cf. A000176.
%Y A000061 Sequence in context: A063200 A063224 A023847 this_sequence A153176 A112921 
               A008133
%Y A000061 Adjacent sequences: A000058 A000059 A000060 this_sequence A000062 A000063 
               A000064
%K A000061 nonn
%O A000061 1,3
%A A000061 N. J. A. Sloane (njas(AT)research.att.com).
%E A000061 More terms from Kok Seng Chua (chuaks(AT)ihpc.nus.edu.sg), Jun 03 2000
%E A000061 It would be nice to have a more precise definition! - N. J. A. Sloane 
               (njas(AT)research.att.com), May 26, 2007