tl; dr

```
point2d(enumerate(agen(10),1))
```

Here is one possibility. Suppose `A`

contains the terms of the sequence and we assume they are labelled starting at 1.

```
A = [(-1)^n/n for n in range(1,20)]
pts = [(i,ai) for i,ai in enumerate(A,1)]
point2d(pts)
```

The idea is to construct a list of points that consists of ordered pairs $(i,a_{i})$ to be sent as an argument to point2d.

In your case you may be able to construct `A`

as follows:

```
A = [ai for ai in agen(10)]
```

Perhaps you could skip that part and directly construct the list of points:

```
pts = [(i,ai) for i,ai in enumerate(agen(10),1)]
```

If we are confident enough, then we may just skip all steps and arrive at:

```
point2d(enumerate(agen(10),1))
```