I have an array formula, that returns a 12x1 array of numbers. If I return
that array to a range, then =COUNT(range) returns 12, but =COUNT(formula)
returns zero, while =COUNTA(formula) returns 12. All formulas [with the
obvious exception of =COUNT(range)] are array entered. What gives?

Jerry

The formula is
MMULT({1,0}+{-1,1}/(1+(B$31/$D$2:$D$13)^$A32),INDEX(LINEST($C$2:$C$13,{1,0}+{-1,1}/(1+(B$31/$D$2:$D$13)^$A32),0),1,{2;1}))-$C$2:$C$13