直角三角型 依層數 (15279)

C2:Q16=IF((ROW(A1)<COLUMN(A1))+(ROW(A1)>$A$2)+(COLUMN(A1)>$A$2),"","*")

S2:AG16=IF((COLUMN(A1)-$A$2+ROW(A1)<=0)+(ROW(A1)>$A$2)+(COLUMN(A1)>$A$2),"","*")