Search: id:A005647
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%I A005647 M3066
%S A005647 1,1,3,19,217,3961,105963,3908059,190065457,11785687921,907546301523,
%T A005647 84965187064099,9504085749177097,1251854782837499881,191781185418766714683,
%U A005647 33810804270120276636139,6796689405759438360407137,1545327493049348356667631841
%N A005647 Salie numbers.
%D A005647 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A005647 L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 87, Problem 32.
%H A005647 T. D. Noe, <a href="b005647.txt">Table of n, a(n) for n=0..100</a>
%F A005647 Expand cosh x / cos x and multiply coefficients by n!/(2^(n/2)).
%F A005647 a(n) = 2^(-n)*Sum_{k=0..n} A000364(k)*binomial(2*n, 2*k)). - DELEHAM 
               Philippe (kolotoko(AT)wanadoo.fr), Jul 30 2003
%Y A005647 a(n) = A000795(n)/2^n.
%Y A005647 Sequence in context: A058165 A074707 A135749 this_sequence A158876 A001833 
               A001035
%Y A005647 Adjacent sequences: A005644 A005645 A005646 this_sequence A005648 A005649 
               A005650
%K A005647 nonn,easy,nice
%O A005647 0,3
%A A005647 Simon Plouffe (simon.plouffe(AT)gmail.com), N. J. A. Sloane (njas(AT)research.att.com).

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