Consider the Maple lines
r := n -> (n-(n mod 2))/2:
seq(print(seq(r(n-k) + r(n+k), k = -n..n)), n=0..5);
Output:
0
1, 0, 1
2, 1, 2, 1, 2
3, 2, 3, 2, 3, 2, 3
4, 3, 4, 3, 4, 3, 4, 3, 4
5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5
I thought that the Sage equivalent is
r = lambda n: (n-(n%2))//2
for n in range(6):
[r(n-k) + r(n+k) for k in (-n..n)]
Unfortunately this is not the case. I get
"AttributeError: 'xrange' object has no attribute 'next'".
Is this a bug or a feature?
