#set page(width: 10cm, height: auto)
#set heading(numbering: "1.")

= Fibonacci sequence

The Fibonacci sequence is *defined throught* the recurrence relation $F_n = F_(n-1) + F_(n-2)$.
It can also be expressed in _closed form_.

$ F_n = round(1 / sqrt(5) phi.alt^n), quad
 phi.alt = (1 + sqrt(5)) / 2 $

#let count = 8
#let nums = range(1, count + 1)
#let fib(n) = (
    if n <= 2 { 1 }
    else { fib(n - 1) + fib(n - 2) }
)

The first #count numbers of the sequence are:

#align(center, table(
    columns: count,
    ..nums.map(n => $F_#n$),
    ..nums.map(n => str(fib(n)))
))