题解 | #统计每个月兔子的总数#

递归，born()函数初始兔子数量是1，每只兔子最终都会从出生后月份➕2开始生，所以循环这几个月份，兔子祖宗都要生一只崽，

所以最后就是在循环里面嵌套调用兔子出生函数即可。

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

function bron(totalMon,bornMon){
    let sum=1;
    for(let i=(bornMon+2);i<=(totalMon);i++){
        sum=sum+bron(totalMon,i);
    }
    return sum;
}


(async () => {
    let n = await readline();
    n=Number(n);
    console.log(bron(n,1));
})()