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<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 41 - Try It</title>
</head>
<body>
  <h1>Square Numbers Pyramid</h1>
  <p>Edit <code>rows</code> and click Run.</p>
  <pre id="output"></pre>
  <script>
    const rows = 5;
    let m = 0;
    let result = "";

    for (let r = 1; r <= rows; r++) {
      let line = " ".repeat(4 * (rows - r));
      for (let k = 0; k < 2 * r - 1; k++) {
        m += 1;
        line += String(m * m).padStart(4, " ");
      }
      result += line + "\n";
    }

    document.getElementById("output").textContent = result;
  </script>
</body>
</html>

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JavaScript Number Pattern 41 (Try It)