How can I get Excel to automatically adjust sequential numbers in a column when I add or delete Rows?

A1 is header, A2 is first serial number, A3=IF(COUNTA(B3:IV3)>0,MAX(A$1:A2)+1,"") Copy down as far as you wish.

Enter the s.no 1 and drag till you want , thre will be a icon will appear, clik and select the fill series option.

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