The boxes may have different shapes, as long as they all have the same volume and right angle corners.
Table of n, a(n) for n=1..6.
Johan Nilsson, Illustrations for terms up to a(5).
There are eight ways to dissect a cube into four boxes of equal volume, so a(4)=8.
Cf. A108066 is a 2D version of the dissection count.
Sequence in context: A030972 A213227 A020009 * A007508 A122674 A203762
Adjacent sequences: A257552 A257553 A257554 * A257556 A257557 A257558
Johan Nilsson, Apr 29 2015