OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Alkane Graph
Eric Weisstein's World of Mathematics, Dominating Set
Index entries for linear recurrences with constant coefficients, signature (5).
FORMULA
a(n) = 81*5^(n-2) for n > 1.
G.f.: x*(4*x - 17)/(5*x - 1).
E.g.f.: (81*exp(5*x) + 20*x - 81)/25. - Stefano Spezia, Sep 04 2021
MATHEMATICA
Join[{17}, LinearRecurrence[{5}, {81}, 20]]
CoefficientList[Series[(4 x - 17)/(5 x - 1), {x, 0, 20}], x]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Eric W. Weisstein, Sep 04 2021
STATUS
approved