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Exercise I

Posted 02/23/2015
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A monomial is a polynomial wich has only one term with `1` as coefficient. The degree of a monomial is the sum of degrees of all the variables.

For example, `x^2yz^3` is a monomial of degree `6`.

`a(n)` is the number of monomials of degree at most `n` in `n` variables.

For example, `a(2)=6` because we have monomials `1`, `x_1`, `x_2`, `x_1x_2`, `x_1^2` and `x_2^2`.

Find `a(n)`.