case of n = 2 handled separately
if ( $ n == 2 ) echo " - 1 STRNEWLINE " ; else { $ b = $ n * $ n / 4 - 1 ; $ c = $ n * $ n / 4 + 1 ; echo " Side ▁ b ▁ = ▁ " . $ b . " , ▁ Side ▁ c ▁ = ▁ " . $ c . " STRNEWLINE " ; } }