12 Days of Christmas

Too many to fit in my house, particularly those maids a-milking. Do you have any idea of the packing problem to be solved trying to fit that many maids, stools, and cows into my living room? And the cubic space required for just one even small lord a-leaping does not bear thinking about.
 
I'm not totally up on the song but if it follows the pattern I think it does.

[MATH]\sum \limits_{n=1}^{12} \sum \limits_{k=1}^n~k = 364[/MATH]
 
My answer is 364 also (using association and symmetry):

(2)(12 + 22 + 30 + 36 + 40 + 42) = 364

Must be nice …

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