Libreoffice: sum of column except one cell

I want to calculate the sum of the A column excluding A1, because I want the result there. Illustration:

        A                    B      C
1    =SUM(A2:Ainfinite)
2     1234
3     5678
...

I could write A2:A1048576 which would work to some degree, but it would not be elegant or foolproof. Is there any notation to express the range from A 2 to A infinite?

Answer

Ehm, I am risking to say something silly here, but why don't you just

Get total number of rows:

ROWS(A:A)

Convert to coordinate of the last cell using INDIRECT:

(INDIRECT("A"&(ROWS(A:A))))

And use it in your SUM formula

 SUM(A2:(INDIRECT("A"&(ROWS(A:A)))))

I cannot guarantee that this is going to work, as I am currently logged into my Windows machine. But it works on MS Excel.

UPDATE: as correctly noted by tohuwawohu you will need to set formula syntax to Excel A1