In the UKA we have several katas that are practiced to see where Aikido was born from.
20 Jo suburi
9 count kata (2 sides [attacker & defender])
13 count katta (2 sides)
31 count katta (2 sides)
Rumor has it that there is a 29 count or so, but that has not made itslef apparent. There is another for the boken i am sure, but i cannot remember it right now.
Hope that helps.