=sequence(a1)
What version of Excel are you using?
I suggest that you update your Account details (or click your user name at the top right of the forum) so helpers always know what Excel version(s) & platform(s) you are using as the best solution often varies by version. (Don’t forget to scroll down & ‘Save’)
If you have 2021 or 365 how aboutExcel Formula:=sequence(a1)