  The 2-Fano varieties, defined by De Jong and Starr, satisfy some higher
dimensional analogous properties of Fano varieties. We propose a definition of
(weak) $k$-Fano variety and conjecture the polyhedrality of the cone of
pseudoeffective $k$-cycles for those varieties in analogy with the case $k=1$.
Then, we calculate some Betti numbers of a large class of $k$-Fano varieties to
prove some special case of the conjecture. In particular, the conjecture is
true for all 2-Fano varieties of index $\ge n-2$, and also we complete the
classification of weak 2-Fano varieties of Araujo and Castravet.
