Initializing an array of 13 button objects - a more compact way?

This works, but I was wondering if there was a more compact syntax for what I am doing.
I'm creating an array that contains 13 UIButton objects as follows:
NSArray * myButtonObjects;
myButtonObjects = [NSArray arrayWithObjects: [UIButton buttonWithType:UIButtonTypeRoundedRect],
[UIButton buttonWithType:UIButtonTypeRoundedRect], [UIButton buttonWithType:UIButtonTypeRoundedRect],
[UIButton buttonWithType:UIButtonTypeRoundedRect], [UIButton buttonWithType:UIButtonTypeRoundedRect],
[UIButton buttonWithType:UIButtonTypeRoundedRect], [UIButton buttonWithType:UIButtonTypeRoundedRect],
[UIButton buttonWithType:UIButtonTypeRoundedRect], [UIButton buttonWithType:UIButtonTypeRoundedRect],
[UIButton buttonWithType:UIButtonTypeRoundedRect], [UIButton buttonWithType:UIButtonTypeRoundedRect],
[UIButton buttonWithType:UIButtonTypeRoundedRect], [UIButton buttonWithType:UIButtonTypeRoundedRect], nil];
Is there a shorter way of doing this, like specifying the number of UIButton objects I want to create the NSArray with?
Thanks,
doug

Since my first long statement where I repeated the UIButton object 13 times worked, I thought this would work as well:
NSArray *theButtons;
for (i=0; i<13; i++) {
[theButtons arrayByAddingObject:[UIButton buttonWithType:UIButtonTypeRoundedRect]];
That compiles, but it doesn't work like the original. The program crashes when it tries to run that loop.
doug

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