1 | initial version |

You can use the `prod()`

function (see prod? for some help):

```
sage: f = lambda n, k, i : prod([binomial(n+k-l,k) for l in range(1,i+1)])
sage: f(3,4,2)
75
```

This also works symbolically:

```
sage: var('n,k')
(n, k)
sage: f(n,k,2)
binomial(k + n - 2, k)*binomial(k + n - 1, k)
```

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