各數字間 空白數 (14303)

D3{=IFERROR(INDEX(FREQUENCY(IF(A$3:A$22="",ROW($3:$22)),IF(A$3:A$21<>"",ROW($3:$21))),ROW(A1)+(A$3<>"")),"")

另解{=IFERROR(NPV(-2,SMALL(IF(A$2:A$22<>"",ROW($2:$22)),ROW(1:2)+(A$3<>"")))-1,"")