%I A053525
%S A053525 1,0,1,4,23,166,1437,14512,167491,2174746,31374953,497909380,8619976719,
%T A053525 161667969646,3265326093109,70663046421208,1631123626335707,40004637435452866,
%U A053525 1038860856732399105,28476428717448349996,821656049857815980455
%N A053525 E.g.f.: (1-x)/(2-exp(x)).
%D A053525 R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see 
               Problem 5.4(a).
%H A053525 T. D. Noe, <a href="b053525.txt">Table of n, a(n) for n=0..100</a>
%Y A053525 a(n)=c(n)-n*c(n-1) where c() = A000670.
%Y A053525 Cf. A005840.
%Y A053525 Sequence in context: A007297 A111547 A158884 this_sequence A113869 A084357 
               A075729
%Y A053525 Adjacent sequences: A053522 A053523 A053524 this_sequence A053526 A053527 
               A053528
%K A053525 nonn,nice,easy
%O A053525 0,4
%A A053525 N. J. A. Sloane (njas(AT)research.att.com), Jan 15 2000