[рони]

Іван,

<pre id="out"></pre>
    <script>
        function fn(all) {
            if (all % 4) return;
            let m = all / 4 - 1;
            if (m < 3) return;
            const arr = [];
            for (let b = 1; b < m; b++) {
                for (let v = 1; v < m; v++) {
                     if(b + v > m) continue;
                    for (let n = 1; n < m; n++) {
                        let s = (b + v + n) * 4;
                        if (s == all) arr.push([b, v, n])
                    }
                }
            }
            return arr
        }
        out.append(JSON.stringify(fn(40))
)
    </script>