OFFSET
0,3
FORMULA
E.g.f.: e^x*(1-e^x)/(1-4*e^x+2*e^(2*x)).
a(n) = Sum_{k = 0..n} (-1)^(n-k) * k! * S2(n, k) * A000129(k).
a(n) ~ n!/(4*log(1+1/sqrt(2))^(n+1)). - Vaclav Kotesovec, Sep 26 2013
MATHEMATICA
CoefficientList[Series[E^x*(1-E^x)/(1-4*E^x+2*E^(2*x)), {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Sep 26 2013 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Paul Barry, Apr 20 2005
STATUS
approved