OFFSET
0,3
LINKS
FORMULA
G.f.: x/(1-20*x+50*x^2);
a(n) = ((10 + 5*sqrt(2))^n - (10 - 5*sqrt(2))^n)/(10*sqrt(2)).
MATHEMATICA
LinearRecurrence[{20, -50}, {0, 1}, 30] (* Harvey P. Dale, Aug 04 2021 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Mar 26 2004
STATUS
approved