A sequence or a series, in mathematics, is a string of objects, like numbers, that follow a particular pattern. The individual elements in a sequence are called terms. A simple example is 3, 6, 9, 12, 15, 18, 21, ..., where the pattern is: "add 3 to the previous term".
In this kata, we will be using a more complicated sequence: 0, 1, 3, 6, 10, 15, 21, 28, ... This sequence is generated with the pattern: "the nth term is the sum of numbers from 0 to n, inclusive".
[ 0, 1, 3, 6, ...]
0 0+1 0+1+2 0+1+2+3
Your Task
Complete the function that takes an integer n and returns a list/array of length abs(n) + 1 of the arithmetic series explained above. When n < 0 return the sequence with negative terms.
Examples
5 --> [0, 1, 3, 6, 10, 15]
-5 --> [0, -1, -3, -6, -10, -15]
7 --> [0, 1, 3, 6, 10, 15, 21, 28]
def sum_of_n(n):
# your code goes here
return []def sum_of_n(n):
if n < 0:
return sorted([sum(x for x in range(i,1)) for i in range(n, 1)], reverse=True)
else:
return [sum([x for x in range(i+1)]) for i in range(n+1)]