OFFSET
0,2
FORMULA
E.g.f.: exp(x/(1-x-x^2))/(1-x-x^2).
D-finite with recurrence a(n) = 2*n*a(n-1) + (n-1)^2*a(n-2) - 2*(n-2)^2*(n-1)*a(n-3) - (n-3)*(n-2)^2*(n-1)*a(n-4). - Vaclav Kotesovec, Sep 29 2013
a(n) ~ 5^(-3/8)*sqrt(7+3*sqrt(5))/2 * ((1+sqrt(5))/2)^(n-1)* exp(2*sqrt(n)/5^(1/4)-n-1/10) * n^(n+1/4) * (1 + sqrt(-73/600 + 293329/(288000*sqrt(5)))/sqrt(n)). - Vaclav Kotesovec, Sep 29 2013
MATHEMATICA
CoefficientList[Series[E^(x/(1-x-x^2))/(1-x-x^2), {x, 0, 20}], x]* Range[0, 20]! (* Vaclav Kotesovec, Sep 29 2013 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Emanuele Munarini, Mar 28 2003
STATUS
approved