I want to produce a vector starting at 1 and stopping at 900, where each increase is based on taking the last generated number and adding 1 and then multiplying it with 1.55; and then round it to the nearest number. 

That is the sequence should be:

```
First number:  1 (i.e., start at 1)

Second number: 3 (i.e., (1+1)*1.55)

Third number:  6 (i.e., (3+1)*1.55)

```

I have tried:

```
 x0=1
 seq(x0, 600, (+1*1.55))

```