Lovely numbers

Lovely numbers
One, two,
Buckle my shoe;
Three, four,
Knock at the door;
Five, six,
Pick up a sticks;
Seven, eight,
Lay them straight;
Nine, ten,
A big fat hen;
Eleven, twelve,
dig and delve;
Thirteen, fourteen,
Maids a-courting;
Fifteen, sixteen,
Maids in the kitchen;
Seventeen, eighteen,
Maids in waiting;
Nineteen, twenty,
My plate's empty!