NERD ATTACK:
[9_C_2]^2=1296
Thanks for breaking the "nerds are smart" stereotype. More power to you!
I do that stuff a lot with my elementary aged children, enough that I just assumed it was asking how many rectangles there were, and vomited the answer. Thanks for your supportive vomit analysis though. I guess you didn't notice I edited my answer.
NERD ATTACK:
[9_C_2]^2=1296
Thanks for breaking the "nerds are smart" stereotype. More power to you!