Last K Numbers Sequence JS Advanced

function generateSequence(n, k) {
    let seq = [1];

    for(let i = 1; i < n; i++) {
        let sum = 0;
        for(let j = i - k; j < i; j++) {
            if(j >= 0) {
                sum += seq[j];
            }
        }
        seq.push(sum);
    }
    return seq;
}