This arrayed formula will work
=SUM(A1:A100*(MOD(ROW(A1:A100),20)>0))
...confirmed by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL+SHIFT+ENTER you will get an error or a clearly incorrect answer. Press F2 on that cell and try again.
Does that work for you?
or non-arrayed
=SUMPRODUCT((A1:A100), --(MOD(ROW(A1:A100),20)>0))
ChemistB
My 2?
substitute commas with semi-colons if your region settings requires
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