RosettaCodeData/Task/Catalan-numbers-Pascals-triangle/JavaScript/catalan-numbers-pascals-triangle-1.js

var n = 15;
for (var t = [0, 1], i = 1; i <= n; i++) {
    for (var j = i; j > 1; j--) t[j] += t[j - 1];
    t[i + 1] = t[i];
    for (var j = i + 1; j > 1; j--) t[j] += t[j - 1];
    document.write(i == 1 ? '' : ', ', t[i + 1] - t[i]);
}