Fifteen puzzle solvability, Numworks Python

[Don Shepherd]

Albert, I don't get the expected results for this data:

a=[11,3,8,1,6,15,10,7,14,2,13,4,12,9,5]

the empty cell is right after 11

the result should be even (52 per my algorithm), but it is odd (11)

the sorted(a) == range(1,n*n) command always returns FALSE, not TRUE

Don