_{1}, p

_{2},...p

_{7}) of 1,2, ...7; such that for all k 1≤k≤6, (p

_{1}, p

_{2},... p

_{k}) is not a permutation of (1,2, ...k); i.e., p

_{1}≠1; (p

_{1}, p

_{2}) is not a permutation of (1,2), etc.

What would be the answer if we specify 1≤k<6 instead?