OFFSET
1,1
LINKS
FORMULA
From Colin Barker, Aug 19 2013: (Start)
a(n) = 10*a(n-2) for n>3.
G.f.: x*(10*x^2-9*x-10) / (10*x^2-1). (End)
E.g.f.: x + 9*(cosh(sqrt(10)*x) - 1 + sqrt(10)*sinh(sqrt(10)*x))/10. - Stefano Spezia, Jun 11 2022
MATHEMATICA
LinearRecurrence[{0, 10}, {10, 9, 90}, 25] (* Stefano Spezia, Jun 11 2022 *)
CROSSREFS
KEYWORD
base,nonn,easy
AUTHOR
Amarnath Murthy, May 06 2002
STATUS
approved