I want to automatically generate the following recursive numerical sequence
in a column (e.g., column "A"): a1=0, a2=9, a3=10, a4=19, a5=20, a6=29,
a7=30, a8=39, a9=40, a10=49, a11=50 ... etc up to about a2000. I have not
been able to figure out a formula to use with click and drag.