Search: id:A000556
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%I A000556 M3966 N1638
%S A000556 1,1,5,31,257,2671,33305,484471,8054177,150635551,3130337705,71556251911,
%T A000556 1784401334897,48205833997231,1402462784186105,43716593539939351,
%U A000556 1453550100421124417,51350258701767067711,1920785418183176050505
%N A000556 Expansion of exp(-x) / [ 1 - exp(x) + exp(-x) ].
%D A000556 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A000556 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A000556 G. Ledin, On a certain kind of Fibonacci sums, Fib. Quart., 5 (1967), 
               45-58.
%F A000556 Sum(k!*fibonacci(k + 1)*stirling2(n, k), k = 0 .. n).
%Y A000556 John Layman (layman(AT)calvin.math.vt.edu) observes that this is also 
               Sum (-2)^k*binomial(n, k)*b(n-k), where b() = A005923.
%Y A000556 Cf. A005923.
%Y A000556 Sequence in context: A056541 A126121 A167137 this_sequence A125598 A058892 
               A056187
%Y A000556 Adjacent sequences: A000553 A000554 A000555 this_sequence A000557 A000558 
               A000559
%K A000556 nonn,easy
%O A000556 0,3
%A A000556 N. J. A. Sloane (njas(AT)research.att.com).

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