Fibonacci Sequence Python Algorithm 

def fib(num): # define function parameter = num
   if num == 0 or num == 1: # if num is equal to 1 or 0, then just return them
      return num
   return fib(num - 1) + fib(num - 2)  # else add the numbers 1 and 2 before the original one

for i in range(20): #loop 20 times 
   print(fib(i))

0
1
1
2
3
5
8
13
21
34
55
89
144
233
377
610
987
1597
2584
4181

function fib(num){
   if(num === 0 || num === 1){
      return num
   }
   return fib(num - 1) + fib(num - 2)
}
for(i=0; i<20; i++){
   console.log(fib(i))
}

0
1
1
2
3
5
8
13
21
34
55
89
144
233
377
610
987
1597
2584
4181