$$f\left(x\right)=\sum_{n=1}^{x}nb-f_{1}\left(f\left(n-1\right)\right)$$
$$b=2$$
$$f_1(x)=x^2$$
$$f(1)=b$$
How can I define this whole series in Desmos?
$$f\left(x\right)=\sum_{n=1}^{x}nb-f_{1}\left(f\left(n-1\right)\right)$$
$$b=2$$
$$f_1(x)=x^2$$
$$f(1)=b$$
How can I define this whole series in Desmos?
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