computational-combinatorics/set-partition

export default function* _sequence(init) {
    yield init;
    const a = [init];
    while (true) {
        const n = a.length;
        let current = a[n - 1];
        yield current;
        for (let i = 0; i < n; ++i) {
            const next = current + a[i];
            a[i] = current;
            current = next;
        }

        a.push(current);
    }
}