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  <title>Pascal triangle additive method</title>
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  <h1>Pascal's triangle</h1>
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  <script>document.getElementById("out").textContent=function(t){var n,r,o=[],e=[];for(n=0;n<t;n++){var f=new Array(n+1).fill(1);for(r=1;r<n;r++)f[r]=o[n-1][r-1]+o[n-1][r];o.push(f)}for(n=0;n<o.length;n++){var u="",a=[];for(r=0;r<t-n-1;r++)u+="   ";for(r=0;r<o[n].length;r++)a.push(String(o[n][r]).padStart(6," "));e.push(u+a.join(""))}return e.join("\n")}(5)</script>
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JavaScript Pascal's Triangle — Additive Method (Try It)