array of variable length vectors

Hi,
I'd like to store N vectors of different lengths, and to be able to
access them with an index, and eventually free the memory for one
of them without modifying the indexes to the others.

In C this would be a vector of N pointers that point to memory cells
independently allocated.

For example

int *pv[3];

pv[0] = (int *) malloc(13 * sizeof(int));
pv[1] = (int *) malloc(7 * sizeof(int));
pv[2] = (int *) malloc(110 * sizeof(int));

free(pv[1])
...

What is the best data type (or class) in R to do such a thing?