Lemma practice generator linear-recurrence-term #189,404 · Combinatorics · Recurrences

A term of a linear recurrence

A sequence has $a_{0} = - 1$ , $a_{1} = - 4$ and $a_{n} = 4 a_{n - 1} + a_{n - 2}$ . Find $a_{9}$ .

~5 minAnswer checked instantly

Stuck? A gentle nudge

No hints for this one.

Something off?

Workspace

Your answer

Loading the math keyboard…

Type naturally — sqrt, pi, / and ^ become notation. Any equivalent form is accepted. Press Enter to check.