Excel © lacks a worksheet function "VECTOR(start,increment)" which creates a constant vector like 1, 3, 5, 7 (if start = 1 and increment = 2).
All worksheet function "tricks" like =ROW(INDIRECT("1:3")) have severe drawbacks of being volatile (they are recalculated each time you hit F9) and of depending on all cells in the referred rows.
A user-defined function like sbVector can help here. Please notice that it needs to be entered as an array formula (with CTRL + SHIFT + ENTER, not only with ENTER) into the desired target range.
My tiny Excel add-in Sulprobil.xll also offers a function sbVector. Its parameters are slightly different.