Grouping by Number Tickets in Order

I can't believe I've not been able to work this out for myself- but I'd like to break down orders by the number of tickets they contain. (i.e. for any production the number of orders containing 1 ticket, 2 tickets, 3 tickets etc.)

I'd thought the formula might be (count([Order ID]) , [Ticket Count] ) with ticket count filtered to =1 or =2 or whatever, but that's throwing up some strange numbers that clearly aren't right.

Thanks! 

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