Add all odd numbers from 1 to 20.
1 20 [OP_LIST_ODD] [OP_LIST_SUM]
var_a = 1
var_b = 20
list_a = []
if var_a%2==0:
    for i in range(var_a+1, var_b+1, 2):
        list_a.append(i)
else:
    for i in range(var_a, var_b+1, 2):
        list_a.append(i)
list_a = [float(i) for i in list_a]
var_c = sum(list_a)
print(int(var_c))