diff --git a/1dlife b/1dlife
index 7cf7f92..9d96d10 100755
--- a/1dlife
+++ b/1dlife
@@ -18,22 +18,15 @@ state="${state//[^0]/1}"
 slen=$((${#state} - 1)) # length + 4 (temporary padding) - 5
 
 # complete rule mapping
-declare -A values=(
-  00000 0  00001 0  00010 0  00011 1
-  00100 0  00101 0  00110 0  00111 1
-  01000 0  01001 1  01010 1  01011 1
-  01100 0  01101 1  01110 1  01111 0
-  10000 0  10001 1  10010 1  10011 1
-  10100 0  10101 1  10110 1  10111 0
-  11000 1  11001 1  11010 1  11011 0
-  11100 1  11101 0  11110 0  11111 1)
-
+declare -ar values=(0 0 0 1 0 0 0 1 0 1 1 1 0 1 1 0 \
+                    0 1 1 1 0 1 1 0 1 1 1 0 1 0 0 1)
+  
 for ((i=0; i<ITERS; ++i)); do
   state="00${state}00" # pad the current state from both sides
   newstate=''
   for ((k=0; k<slen; ++k)); do
     vidx="${state:k:5}"
-    newstate="${newstate}${values[$vidx]}"    
+    newstate="${newstate}${values[$((2#$vidx))]}"    
   done
   state="$newstate"
   newstate="${newstate//0/ }"