Odd sized Dutch guns: 20pdr, 15pdr, 10pdr, and 5pdr

The usual Dutch guns, by shot weight in the mid-17th Century were 3pdr, 4pdr, 6pdr, 8pdr, 12pdr, 18pdr, and 24pdr. There was an alternate series of guns: 5pdr, 10pdr, 15pdr, and 20pdr. I happen to have weights for those particular pieces, at least the ones used on ships of the Admiralty of Zeeland (from a list from 27 March 1653):

20pdr bronze   3781 lbs
15pdr bronze   2750 lbs
10pdr iron     3162 lbs
 5pdr iron     1530 lbs
 5pdr bronze   1406 lbs