1, 3, 8, 15, 27, 50, 92, 169, 311….?

var a=1,b=3,c=4,n=10,i=0,sum=0;

console.log(a);
console.log(b);

for(i=4;i<=n;i++){
  sum = a+b+c;
  console.log(sum);
 
  a=b;
  b=c;
  c=sum;
}