```
var countAndSay = function(n) {
if (n === 0) return '';
if (n === 1) return '1';
const t = countAndSay(n - 1);
let s = '';
let stack = [t[0]];
for (let i = 1; i < t.length; i++) {
if (t[i] === stack[stack.length - 1]) {
stack.push(t[i]);
} else {
s += stack.length;
s += stack[0];
stack = [t[i]];
}
}
if (stack.length > 0) {
s += stack.length;
s += stack[0];
}
return s;
};
```