Sequences

Look-and-say sequence

$1,11,21,1211,111221,\cdots$

Don’t think too much. Just read and count it in English.

Fibonacci sequence

The Fibonacci sequence is given by

$$F_0=0$$ $$F_1=1$$ $$F_{n+2}=F_{n+1}+F_n$$

File: Material/fibonacci.sagews