An -he (a term coined by Brendan Owen) is
a shape formed from a polyhex by removing half of each
hexagon in such a way that the remaining pieces are connected (Clarke). The numbers
of -hes for , 2, ... are given by 1, 4, 13, 50, 276, 1416, 7201, 37972,
... (OEIS A057712; Clarke).