How to output different posts per page?

I want to display one blog article less than on the following pages. The following code works but the the paginaton on the first page displays 1, 2, 3, 4 and on the next pages i get the correct pagination of 1, 2, 3 – What am i doing wrong?

I’m using a custom Theme based on Chisel with Timber. This is my home.twig:

I stumbled upon a similar question here on stackexchange which helped with my problem: Take a look at Case #2 and especially the comment of mach